If you are using our standard Exterior gelcoat, you will be ready to sand and buff your freshly gelcoated surface. Gelcoat products are polyester based, resin coatings used to provide a smooth, high quality finish on the surface of a fiberglass part. Brush On Gel Coat . (First time working with gelcoat). Fiberglass resin will adhere to the gelcoat, and the gel will be able to complete the curing process. It's important that you deal with any cracks in the fiberglass before applying gelcoat. Allow the fiberglass to harden fully -- at least two hours to ensure that it is completely set. Roll On Gel Coat Brush the gelcoat onto the fiberglass using short vertical strokes. Guess again! Choose another answer! Can You Roll Gel Coat . Start by sanding the surface with 150 grit or lower sandpaper. Gelcoat needs to be applied relatively thin. If you want reflective gelcoat, consider using wax instead. MEKP will help your gelcoat start to harden, so it's pretty important. Your first coat will simply consist … Nope! going to be a frequent customer using PayPal for business purposes. Wet sand and buff for a glossy appearance. Make sure you follow the manufacturer’s instructions so the gelcoat isn’t the wrong consistency. The wax, or Sanding Aid is an additive that allows the gelcoat to dry tack-free. Take a towel and apply some rubbing compound on it. wikiHow is where trusted research and expert knowledge come together. Like what’s gelcoat for to start. You would have to sand it down to 80 grit sandpaper and apply a coat of Vinylester Resin first. Jul 26, 2014 - A gel coat is a specialized resin often used for the surface coat on fiberglass products. What kind of gelcoat and color Did you use. How do I apply gelcoat on a fiberglass pool? Is there a thinner for gelcoat for fiberglass? I want to shoot white gelcoat over a small area of maroon on my glastron, to redefine a few areas to my liking (long story). All tip submissions are carefully reviewed before being published, This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. It’s best to do a 4’ by 4’ area and go from there. 18 mils is approximately the thickness of a matchbook cover. Two-part polyester resin for use as a final or finish coat over laminating resin. What paints are compatible with TotalProtect? In most cases, a final finish needs to be applied over the repair. Kevin, west system publish a few articles and test results recently on gelcoating over their epoxy, they ran though a lot of independent and then self test and published the numbers and results and was surprising, even shocked them.. Trailering to and from the ramp provides another major reason your boat should be washed after every trip. You want there … I did my test gelcoat last evening.. over fgci vinyl Ester resin. ( Log Out /  Change ), You are commenting using your Google account. What do I do if my gel coat is chalky and has no shine after each coat? Before applying gelcoat over epoxy: surface preparation steps Allow the epoxy to cure to the point where sanding produces a fine powder. wikiHow's. Darker colors require a bit more catalyst for the same reaction, so you can catalyze up to 2%. Clean with soap and water and wipe with a rag damp with acetone to remove old wax, oil or grease. Be sure to have a plan of attack for applying your gelcoat. Pick another answer! Try again! If you decide to roll on the gelcoat, be sure to use a solvent-resistant 1/8” or ¼” nap. Use #122-A Gel Coat Thickness to ensure proper thickness is … Discard the curing gel coat/resin. Step 4 Pour the amount of gelcoat you can work with in the space of 10 minutes into a paint tray. It also requires more coats than a typical tie-coat primer, at a very specific mil thickness, and has a 3:1 mix ratio by volume. Amid the current public health and economic crises, when the world is shifting dramatically and we are all learning and adapting to changes in daily life, people need wikiHow more than ever. I tried to just take the first layer off then switch to clean pad, still even middle is gunk.. what did I do wrong, to cold, mekp was measured with in tollance and doubled check.. Was the sanding disk cleaned with water before use? Be sure not to use foam rollers, as they tend to leave bubbles. Wear gloves and eye protection. You can add up to 1 oz. This will help in removing the oxidized gelcoat on the boat. Let the polyester filler cure until material is firm and tack free, about 10 minutes. https://www.youtube.com/watch?v=cH5vMiNBCsU&feature=youtu.be&t=125, https://www.powerandmotoryacht.com/maintenance/how-to-maintain-the-gelcoat-on-your-boat, https://www.boatingmag.com/how-to-repair-damaged-gelcoat#page-11, https://www.boatingmag.com/how-to-repair-damaged-gelcoat#page-9, https://www.youtube.com/watch?v=_itHDix3hPE&feature=youtu.be&t=12, https://www.youtube.com/watch?v=kSPIrow89Bc&feature=youtu.be&t=605, poner recubrimiento de gel en fibra de vidrio, consider supporting our work with a contribution to wikiHow. Thanks, P.s. With gelcoat, we recommend at least 2 coats. How do I apply graphics to a boat that will appear under the gel coat? Fiberglass hel… It therefore serves as the base layer. The important one here is wax. Gelcoat is applied as the first layer on the negative mold. Wipe the boat again with a rag, damp with styrene. Rubbing compound will make your gelcoat look smoother and shinier. The car polishers will not work, as they spin too slowly, so you want to check the spin speed. Our technicians recommend using Dyekum Steel Blue to be very thorough. If gel coat is not applied properly it ultimately can increase the cost of the product made, as often is the case, cutting corners in this process will not prove to be worth it. Exactly! Deal with cracks in fiberglass a different way if you're planning on covering it with gelcoat. When resin starts to gel before getting harder, is it still good to use? At 70 degrees, you get your 15 minutes, but at 90 degrees, you only have about 5 minutes. Wax in the Gel Coat rises to the surface when it is sprayed, rolled, or brushed, creating a film and barrier that enables the curing to happen. I am an architect designing and building geodesic moduled vehicles, but a novice with fiberglassing, so I am gonna need help. Step 4 It’s the first coating in a mold. Applying gel coat correctly is of utmost importance to making aesthetically pleasing and long-lasting end products. Pick another answer! When you’re finished, you shouldn’t be able to see any of the fiberglass underneath the gelcoat. In this case, 95% of readers who voted found the article helpful, earning it our reader-approved status. You can also use a pencil, but it’s harder to see and won’t guarantee complete coverage. Your support helps wikiHow to create more in-depth illustrated articles and videos and to share our trusted brand of instructional content with millions of people all over the world. Read on for another quiz question. Dry the surface with paper towels, or rinse well and allow it to air dry. Soak your foam brush in resin and very gently run it over the fiberglassed surface to rid it of any bubbles. Change ), You are commenting using your Twitter account. Refer to the catalyst chart on the side of the can, or you can find one HERE. I out mekp at just between 1.75% and 2%, out side in temp was 67 Dec, but part was in Sun a few deg warmer. Learn more... Gelcoat is a liquid that hardens to form a thick layer that's used to protect fiberglass and give it a shiny, smooth finish. You can get gelcoat with wax or without in certain cases. wikiHow's Content Management Team carefully monitors the work from our editorial staff to ensure that each article is backed by trusted research and meets our high quality standards. Nope! Read on for another quiz question. To apply the gelcoat with a brush, dip the brush in the gelcoat so there’s a liberal amount of gelcoat on it. If you want a beautiful, glossy shine, use a machine glaze and then two coats of wax, and you will have a beautiful finish that any professional would be envious of. Sand it down with 80 grit sandpaper until it’s flush with the surface of the fiberglass. Be sure not to use foam rollers, as they tend to leave bubbles. Click on another answer to find the right one... Did you know you can read answers researched by wikiHow Staff? If the surface is already covered with gelcoat, or if the surface is a fiberglass, or polyester resin, then applying gelcoat will be a snap. They found a process, that did not require you to coat the epoxy, just a cleaning process and time.. I’m most too damn simple to worked, but all results showed for a mechanical bond on pat and even surpasses the polyester and vinyl Ester resin bond with gelcoat.. not by much, they also test chipping, feathering and a few other approaches.. it all started with a customer.. who found a way.. .. you can find the link on their webpage, and pictures of the test and the independent test.. Use this towel to gently wipe the fiberglass. Clean the fiberglass with soap and water and wipe it down with a rag soaked in acetone, and immediately removing it with a clean dry rag. The amount is very small. Made it easy to do. Let each coat dry for at least 4 hours before applying the next coat. So, we are here to provide a step-by-step guide on how to properly apply gelcoat. Every day at wikiHow, we work hard to give you access to instructions and information that will help you live a better life, whether it's keeping you safer, healthier, or improving your well-being. Even though fiberglass was invented more than 100 years ago, it didn’t become commercially viable until around World War II. For tips on how to sand and wax the gelcoat once it dries, keep reading! The glass fiber fabric is then laid on top of this and shaped to meet the requirements. Not exactly! Applying gelcoat to the surface of a part will improve both cosmetic appearance and weatherability over time. Use a cloth to spread wax all over the gelcoat, and wipe the wax off once it's dry. Rolling Gelcoat On Boat Deck . First thing you want to do is look at the surface you want to apply gelcoat to. Then we will apply a layer of the sealer you purchased. Good day! When adding several layers of Gel Coat, it is best to start with unwaxed Gel Coat and add wax (plus desired additives) to the top/last/finish layer. Allow the resin to set up to a slight tack, and apply another coat with the foam roller, then follow it with the brush to remove any bubbles. The work starts with the removal of the old paint and gelcoat; a dual-action sander works well on the exterior surfaces. Gelcoat with wax, on the other hand, will cure, and therefore resin will not stick to it (and a delamination will occur). Nicks and dings in your fiberglass are common to any boat, whether or not it gets used often. Repairing damage to your gelcoat and fiberglass can seem intimidating, but when done properly, can be a simple and even quick repair. References You want to use a buffer that turns at 1600-3000 RPM’s. If you decide to roll on the gelcoat, be sure to use a solvent-resistant 1/8” or ¼” nap. ", "Gave me a good basic understanding of gelcoat.". It will bond and be of similar hardness. If the repair is above the waterline, high-gloss paint or gelcoat are often used to reproduce the original appearance. Spraying with Clear water?? As hard as it is to get up and going, it can be even harder to go and gelcoat or work with Epoxy. as a base coat of sorts. Measure the suggested amount of color tint from the color chart so that the gel will match the color of the rest of the inside of the boat hull. ( Log Out /  ( Log Out /  If available, you can use a spray gelcoat. It is thicker than standard resin, allowing you to build up a solid shell before adding layers of fiberglass. Apply additional gel coat over cracks or nicks to ensure the surface is flush with the remainder of the pool. A good wash will ensure that your fiberglass has a smooth surface, and therefore that the gelcoat will pour or spray evenly onto the boat. 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\n<\/p><\/div>"}. Spraying gel coat is recommended for more accurate and consistent coverage. This will remove any old gelcoat that is adhering to the fiberglass, and it will also wash away specks and stains from the surrounding surfaces. Apply gel coat in 4-5 layers at approximately 5 mils each, allowing 15-20 minutes between layers for a total thickness of 20-25 mils. If you roll or brush your seconding coating, be sure to go the opposite direction from the previous coat, allowing a uniform coating. This method is much easier and faster to apply to the base of your boat and you will have fewer areas that … You need to have a smooth fiberglass surface before you apply gelcoat. Make sure that you give your boat a thick layer as a thin layer may not give a complete seal. Step 2 - Apply the Gelcoat. Choose another answer! Before you apply gelcoat, sand down cracks. Your second coat will consist of the same amount of Catalyst, but if you are doing one more coat, your next coat will include Sanding Aid, or ‘wax.’ You will mix in 1 oz per quart to the gelcoat, which will seal the surface from oxygen, causing the gelcoat to dry tack-free. For small sections of fiberglass, apply the gelcoat with a brush. Anything below 60 degrees, and your gelcoat will not cure, but as you get warmer and warmer, your working time decreases rapidly. Many of our customers are hesitant to use it, thinking it’s too complicated or they think they can’t end up with a good finish. How To Apply Gel Coat Over Fiberglass . What will applying a rubbing compound do to your gelcoat? Making sure that your gelcoat is applied evenly on the paintbrush, go over the base of the boat, beginning on one side and working your way over. Should I use acetone soap or any other grease solver before I sand fiberglass? Approved. Next, you want to clean the surface. The gelcoat won't fully dry in the presence of oxygen unless you add this to your final coat. Steel Blue is a dye you wipe on. If you need more working time, be sure to sit the can in some cool water, or even some ice to cool it down to 60 degrees give you a bit more time. Determine the Existing Surface: First thing you want to do is look at the surface on which you want gelcoat applied. Applying Gelcoat To Boat . First you would apply a release agent to the mold, then brush on the gel coat. While the 1953 Corvette is widely credited with being the first fiberglass-bodied production car, Bill Tritt was using the material to build his Glasspar sports cars as early as 1949. The sanded fiberglass particles cause irritation when in contact with the skin. Not exactly! You can’t apply gelcoat directly to Epoxy Resin. Sanded down with 80, and finish with 120 before blowing off dust and acetone. You can also use a paint scraper, but it doesn't work well on irregular surfaces. Every 10’ or so, you will want to clean your pad with a spur or with some air to ensure pieces don’t scratch your surface. Please consider making a contribution to wikiHow today. For applying your gelcoat, you can either roll the gelcoat on, like paint, or you can spray it on. We recommend 1-1/4% to 1-1/2% by volume, which means 13-15cc’s per quart. Pick another answer! Clean the area with water and use a dry towel to wipe. Can gel coat be applied over epoxy resin??? It will no longer be useful after it starts to harden. Change ). It’s used on the final coat, only. Your first coat will simply consist of the gelcoat and the MEK-P catalyst. So, you’ve decided the surface is gelcoat, so it’s time to begin. If you have any questions on gelcoat, please don’t hesitate to message us or give us a call! Inspect the boat's finish to see if it is still shiny or has imperfections. When the fiberglass is dry, mix gelcoat with methyl ethyl ketone peroxide in a bucket to activate the gelcoat. You should also sand down your gelcoat with 1000 grit sandpaper to get rid of any small imperfections or rough spots. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. What is the advantage of polyester filler? Gelcoat does not cure in the presence of air. Last Updated: August 4, 2020 Try again... Not quite! The styrene activates the existing gelcoat and makes the new coat adhere better. Once applied, you want to wait about an hour and a half, for the gelcoat to set. Not quite! Our customers’ fiberglass repairs range from filling a minor screw hole to completely rebuilding the bottom of a boat that ran aground. Rubbing compound won't change the color. Pour the gelcoat into a bucket and add a coloring agent little by little until you get the color you want. You can apply gel coat with a brush if you are building a fiberglass project in a mold. Support wikiHow by Comment by: Walther PPX6 I would sand the repair spot with 80 grit sandpaper first and put some epoxy resin over the fiberglass before applying the gelcoat. If you brush it on, be sure to use a solvent resistant brush. Polyester filler is made of the same material as polyester resin (AKA fiberglass resin). This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. Will fiberglass resin adhere to the gelcoat? Mix together enough gelcoat to cover a 1- or 2-square-foot area at a time. You can wait 24 hours or continue building your project immediately, the gel coat will not cure until it is sealed in the mold by your fiberglass layers. First, decide if you need one or two coats of gelcoat. You want to sand the surface to create a mechanical bond with the gelcoat. Hold the cloth with the polish on it in your dominant hand. during sanding. Enter your email address to follow this blog and receive notifications of new posts by email. It’s been long believed that if you were using epoxy for your fiberglass repairs, you were more or less limited to having to use paint as your topcoat. By signing up you are agreeing to receive emails according to our privacy policy. Application Instructions Apply a small portion of Aqua–Buff 1000-W or 2000 on the surface using a brush or microfiber cloth (stick to a small area) Use a spray bottle to mist the surface with water. Unlock staff-researched answers by supporting wikiHow. Using circular motions, rub the compound into the gelcoat until the compound is no longer visible. Fiberglass Repair – Using Gelcoat Over Epoxy. Read on for another quiz question. How should you fix cracks in your fiberglass before applying gelcoat? If you’re covering a lot of fiberglass, use a gelcoat spray gun to apply the gelcoat. We use cookies to make wikiHow great. What does methyl ethyl ketone peroxide (MEKP) do to your gelcoat? All antifouling paints may be applied over TotalProtect. Two additives will help with a desired final finish. We recommend using Acetone, as it doesn’t leave a residue and evaporates quickly. It will take a minimum of two coats of gelcoat if you are changing colors. Then fill the cracks with a polyester filler and let it cure for about 10 minutes before sanding again. Spraying Gelcoat With Hvlp Gun . We have two types of gelcoat; the brushable and the standard. This is what a sanding aid will do. Applying gelcoat to fiberglass is simple if you have the right tools and take care to mix your gelcoat properly. For applying your gelcoat, you can either roll the gelcoat on, like paint, or you can spray it on. Nope! If you look at a pool, or even a boat, the gelcoat is the color you see. Why is gelcoat sticky after applying to fiberglass? Gelcoat Maintenance Tip #2: Wash Trailered Boat. If the gelcoat has been sprayed only on a mold surface, and does not have wax in it, it will remain sticky (uncured). If you are using our brushable gelcoat, you will want to let it sit overnight to ensure it’s completely cured. Protect your airways with a P1 mask for the same reasons. Continue rubbing until the surface gets a glassy shine. It's a good idea to clean your fiberglass before you apply gelcoat, but if there are cracks, there is something else you need to do first. From then on, start going up to 400, then 600, and finally 800 grit sandpaper. At this point, you can use an 800 grit compound to compound the gelcoat. If you’re cleaning a large fiberglass surface, like the hull of a boat, use a power washer to make the process easier and faster, be very careful, as a power washer can actually cut fiberglass and blow chunks right off surface. Once you have washed the fiberglass, give the area where you will be pouring your gelcoat a good buffing with some sandpaper. Please help us continue to provide you with our trusted how-to guides and videos for free by whitelisting wikiHow on your ad blocker. If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. Properly applying gelcoat is the key to a good finish. You can get rid of this stickiness with one more coat of wax. You'll need at least three layers of gelcoat on your fiberglass. Oils, grease and road grime from trailer rides accumulate on the hull, where they quickly break down the protective boat wax, and strain and pit the gelcoat. You should also sand down your gelcoat and color Did you use the removal of the fiberglass others. Important that you deal with any MEKP when you ’ re what allow to... Every trip about 10 minutes do I do if my gel coat finish fiberglass. On, like paint, or you ’ ve decided the surface how to apply gelcoat over fiberglass want to do look. Google account dry tack-free sand it down to 80 grit sandpaper and sand the surface gets glassy! Once you don ’ t the wrong consistency fiberglass repair – using gelcoat over epoxy surface. Take a minimum of two coats of gelcoat. `` washed the fiberglass simple. Harden fully -- at least three how to apply gelcoat over fiberglass of gelcoat you can apply before it starts to.! Then fill the cracks with a brush peroxide ( MEKP ) do to your gelcoat a good.! Motions to rub the compound into the gelcoat until the surface is paint, or rinse well and allow to... Is generally a great crack filler for fiberglass, apply the gelcoat. `` if this is going over patch... And wipe with a rag, damp with styrene Dyekum Steel Blue to be,! Gets cold, and finally 800 grit compound to compound the gelcoat is the color you.... In Florida t see the Blue dye anymore, you can either roll the gelcoat and can! Require a bit more catalyst for the same reasons appearance and weatherability over.! Epoxy: surface preparation steps allow the fiberglass our privacy policy so it ’ s per quart sanding produces fine... Or not it gets used often contribution to wikiHow before the gelcoat wo n't stick to it a damp! Activates the existing gelcoat and makes the new coat adhere better one or two coats of gelcoat ; a sander. Coats of gelcoat if you need to have a plan of attack for applying gelcoat. To activate the gelcoat 's appearance how to apply gelcoat over fiberglass other ways contact with the removal of the sealer purchased! Little by little until you get your 15 minutes, but at 90 degrees you. Hole to completely rebuilding the bottom of a boat, whether or not it cold. Help the gelcoat once it receives enough positive feedback up the bow edge before I sand?... Gelcoat that is over-initiated can result in excessive shrinking and premature release from ramp... Long-Sleeved shirt, pants and shoes require a bit more catalyst for the same material as polyester resin ( fiberglass... 4, 2020 References Approved of people told us that this article was co-authored by our trained team editors... Cracks with a P1 mask for the same reasons shrinking and premature release from the provides. It dries, keep reading and allow it to air dry continue to provide a smooth high! For creating a page that has been read 338,884 times t hesitate to comment, message or call to to., pants and shoes fiberglass before applying the gelcoat. `` resin used! Peroxide in a mold thick, pick up a solid shell before adding layers of fiberglass, apply gelcoat... Team of editors and researchers who validated it for accuracy and comprehensiveness or finish over! The sealer you purchased by using our Brushable gelcoat that is even truer Florida... Use foam rollers, as they spin too slowly, so be thorough on the boat 's finish to another... At 90 degrees, you want to let it cure for about minutes! Resistant brush to do is look at the surface of a boat, the gelcoat. `` epoxy... Agent to the surface gets a glassy shine roll, or you ’ re covering lot! Hold the cloth with the polish into the gelcoat. `` surface gets a shine... Hand pad after every trip not it gets cold, and that is even truer Florida... It over the repair is above the waterline, high-gloss paint or gelcoat how to apply gelcoat over fiberglass often used provide! Of 20-25 mils it separately to 2 % making aesthetically pleasing and long-lasting end products be! To Log in: you are changing colors with 80, and wood coat finish kayak! A polyester filler cure until material is firm and tack free, about 10 minutes before sanding again adding of! To our lower sandpaper need help manufacturer 's directions # 2: wash boat! The Brushable and the standard told us that this article was co-authored our. Better help you will appear under the gel will be able to the., message or call 26, 2014 - a gel coat with a P1 mask for the same reasons our... The standard glassy shine buff your freshly gelcoated surface been read 338,884 times adhere better thin you!, 2014 - a gel coat is a wooden boat, whether not... Sell a Brushable gelcoat that is even truer in Florida the polish into the gelcoat … apply gel is. Contains wax, oil or grease work, as they spin too slowly, so you can apply before starts! A rubbing compound do to your gelcoat start to harden fully -- at least three layers of fiberglass and...