The nine-week exposure may not simulate what could happen after many years, but it does indicate that the gelcoat bond to epoxy laminates is a good bond and should perform well. polyester gelcoat often makes problems during demoulding, when using epoxy resins. Put your Gel Coat Application Knowledge to the Test. Pigment Dispersions. Each resealable bottle contains 2 oz. Copyright document.write(new Date().getFullYear()) Website Acquisitions Inc. All rights reserved. I suggest this because flashing off of the gel coat might effect its bonding properties. Gelcoat provides more than just a glossy finish on the boat hull; it also acts as a waterproof barrier to protect the fiberglass underneath from hydrolysis and UV . If the repair area is small, if the damage is cosmetic only (not structural), and with proper surface preparationyes, TotalBoat Gelcoat can be applied directly over cured epoxy-based fairing compound. There are a couple of exceptions. Interestingly, Evercoat states on their can that it is not to be used over epoxy. Polyester pigments can be mixed with Polyester resin and Polyester Gelcoat, Epoxy pigments can be mixed with Epoxy resin and Epoxy gelcoat. Also what about Pettits Tie Coat Primer? Both are used in boatbuilding. The weight of MEKP 925 is 1.125 grams per cc. Where there are structural cracks in the concrete substrate, a 13-oz/.37-kg woven roving mat is layed up over the damaged area before FRP spray up begins. As epoxy is chemically very different to polyester, it doesn't react with the surface, leaving it partially uncured. A wide range of Epoxy and Polyester colour paste pigments are available. Hi Pat! Vinylester is considered to be a hybrid of polyester and epoxy. It's always a safe bet to keep similar products together. LBI's 301 orthothalic polyester resin is a good choice for most repairs. GC50 is a clear, UV stable polyester gelcoat designed specifically for use with epoxy resin laminates. Popular answers (1) Polyester and epoxy resins are chemicaly very resistant, although there are some soluble combinations. http://gougeon32.blogspot.com/search?updated-max=2016-02-16T07:51:00-08:00&max-results=10&start=6&by-date=false. Paint in the mold would be your lightest option I think. Can you apply TotalBoat polyester Gelcoat DIRECTLY over a repair faired with an epoxy-based fairing compound? Take Our Gel Coat Application Quiz! Graphs show the trend of gelcoat bond strength at four time intervals. http://epoxyworks.com/index.php/polyester-over-epoxy/, (You must log in or sign up to reply here.). Jul 18, 2014. This material allows you to use epoxy for the laminate and achieve satisfactory adhesion between the gelcoat and laminate. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This field is for validation purposes and should be left unchanged. Unlike conventional polyester gelcoats, which epoxy resin cannot bond properly to, GC50 cures dry to the touch on the open face and can be fully bonded to by epoxy resin. When considering this idea, there are a few things to keep in mind (and these are VERY important)! I just bought what the guy Im buying it from said would work. 32. The repair is safe? VIBRANT COLORS blend easily into epoxy and polyester resins, and won't fade or discolor VERSATILE PIGMENTS are ideal for a variety of marine, woodworking and craft uses. This is a film that forms on the top layer of epoxy that will inhibit the cure of polyester material as well as create bonding issues. Thank you!! Mark Bowdidge has been using Gelcoat over the epoxy on his boats for years but only on the inside of the boat. Gelcoat IS a Polyester based product so this is the Main Reason to do the repairs to your Polyester Resin Hull. Get a 5% discount on Totalboat products. Click here to see this product & more on Fibreglast.com:http://bit.ly/1PtienNremium Gel Coat with over 900 color options! When the studs were pulled, the failures occurred in the fairing compound, cohesive failure of the gelcoat, or in the bond between the gelcoat and laminate. Forum posts represent the experience, opinion, and view of individual users. Here is the first of 2 video's where I look to see if there's any truth to the belief that polyester based materials (such as gelcoat) won't bond to epoxy. Ideal for color matching gelcoat, tinting epoxy for river tables, wall art, jewelry, and more MIX COLORS EASILY to get just the right custom color for your project Crystic Gelcoat 252PA is a pre-accelerated, isophthalic gelcoat designed as an in-mould gelcoat with excellent adhesion to epoxy resins without the need for a tie-coat. The remaining PATTI studs were pulled at three, six, and nine weeks to determine the long-term effect of moisture on the bond. Those of us using epoxy never put gel coat directly on top the epoxy. You want to make sure that all of the hardener is incorporated into the resin. Let the gelcoat go tacky but hard as above. In repairs above the waterline, gelcoat applied over properly prepared WEST SYSTEM epoxy has a great track record. Basically, there are only two types of fiberglass resin. Description For use in Polyester Based Resins, Gel Coats and Epoxy. by Jeff Wright Vice President of Technical Services. Too much or too little can result un-uncured epoxy. The tests were done on a gelcoat finish over a simulated repair made with WEST SYSTEM epoxy. Please click below to find out more. A hour or two later lay up another patch. I have used this technique of a thin 'seal' of polyester quite a bit on vinylester, epoxy and polyester layups. For full size boats, sometimes a layer of vinylester is used between an epoxy hull and the gelcoat. Brush or spray on a layer of the gelcoat bug enough to divide up into sections. Become A Monthly Supporter Of Boatworks Today Through Patreon! There are boat builders using epoxy layup over gelcoat in the mold and that works but repairing them is another matter. * Cure time and temp. Do I need to coat the EZ-Fair with anything to give it a good bond to the Gel-Coat? As far as I am aware the problems with polyester gelcoat and epoxy stem from fast commercial moulding of parts where the gelcoat is put in mould followed by the epoxy/fabric/core etc layup. They will slowly polymerize in the can without even adding the MEK catalyst.. A wipe-down with acetone and / or a wax remover both before AND after sanding will remove surface contaminates. You may either roll the gelcoat on, like paint, or spray it on, to apply the gelcoat. Each data point is the average tensile load required to pull studs from the surface of different material combinations that were sprayed with gelcoat. Since these three modes of failure occurred under similar loads, it indicates that the strength of the bond is close to the cohesive strength of both the gelcoat and the fairing compound. Epoxy bonds quite good with cured polyester. Because of the difference in curing chemistry, it is not possible to achieve a chemical bond between epoxy and polyester gelcoat. The two layers eventually cure together with a chemical bond between them. Thicker layers are more prone to cracking under stress. Youre safe to use poly above or below the waterline. Boats that are dry sailed or trailered have also had good success with gelcoats on underwater epoxy repairs. Some as limited as 90 days. I would be more interested to see a test of gelcoat over unknown epoxy and left in the weather for a few months. think of it like your foundation if your building an house you want it to sit on the best possible footings. Show excellent weather properties. September 09, 2022 in on-policy model errors in reinforcement learning No Comments 0 . The person doing it is a professional boatbuilder and was working closely with West Systems people in consultation. The fillers of gelcoat vinylester for moulds, on the other hand, may contain glass beads. WEST SYSTEM epoxy is a wonderful material for repairing polyester fiberglass boats. Dont listen to the critics about your videos, the education of these products are money saved in my pocket. As with many products, the surface must be prepared properly; if it is not, then poor curing and adhesion may result. MEK Peroxide Catalyst for Gelcoat/Polyester 2 ounce $ 3.99; Add to cart; Polyester Resin, 1 Gallon $ 50.98; Add to cart; Facebook Youtube Envelope Instagram . Gelcoat is a polyester coating that typically serves as the finish coat for molded fiberglass construction projects. For applications under the waterline a thickness of 20-24 mils aids in blister prevention and is better than thinner layers. Gelcoat derives its name due to it high viscosity and ability to be applied thickly on vertical and overhead surfaces in one coat. How about same prep, epoxy over gelcoat? We know polyester gelcoat can be used over WEST SYSTEM Epoxy. As Jeff Wright wrote in "Polyester Over Epoxy" in Epoxyworks 22: "As with many products, the surface must be prepared properly: if it is not, then poor curing and adhesion may result. Best for Applying Gelcoat, Epoxy etc. All of the test panels had a sealer coat of 105 Resin/206 Slow Hardener to fill the weave and seal the scratches in the sanded fairing compounds. I will typically stir for a minimum of 1 2 minutes. Polyester Gelcoat General purpose moulding gelcoat for hand layup use in GRP construction. Over the years Ive broken the rules on occasion and to date have not had any issues using gelcoat as my topcoat over epoxy. Scrub the surface with clean water, wipe the surface dry with a clean papertowel and this detail is taken care of. (Download 002-550 Fiberglass Boat Repair & Maintenance for details.). 2022 Boatworks Today. per square inch. If youre looking to prevent stress cracks from coming back, Id sand the surface down to bare glass, then apply the new material followed by bottom paint. Wax a piece of glass or tape out some plastic sheeting. Styrene vapors will inhibit and slow the cure of gelcoat. Hi, I wonder whats the difference between epoxy gelcoat and polyester gelcoat ? Gelcoats are modified resins that are applied to molds in a liquid state. Usually I would shoot gelcoat over the mold prior to layup when using polyester resin. Epoxy is a very superior material to polyester for use on underwater repairs for all reasons. Boat Design Net does not necessarily endorse nor share the view of each individual post. Laminating resin (small cans) first, scrape with razor, mask, top a bit high with gelcoat, put clear tape over to cure hard, sand and buff until happy, maybe a little wax or something to seal and polish. Logically the test results should be independent of whether epoxy is applied to gel coat or gel coat is applied to epoxy. An epoxy's relative strength can hold up to 2,000 lbs. Choose from White, Black, Dove Grey, Bright Blue or Dark Olive. This coating is allowed to cure and the epoxy laminate is applied directly to the paint. Please Like or Share above and join the discussion below in our comments section!! One gallon of gelcoat weighs approximately 10.5 lbs. The manufacture has a mold that they coat with a hard-glossy film called Gel Coat. Polyester moulds and epoxy. Your gel probably contains no wax additive and it wont cure until the surface is ' sealed ' from the air. as a Paint, In-mould gelcoat compatibility with epoxy. I'm trying to find whether it would be better to use epoxy to do all the sealing and glassing with paint all over the floor, sides, and console, or if polyester resin and a gelcoat would be better. * A natural by-product of epoxies curing process is something called amine (or amine blush). Two types of gelcoat - 1. per square inch, while a polyester resin can hold less than 500 lbs. Gel coat is air inhibited and cures . It was epoxy laminate into polyester gelcoat with some kind of tiecoat included in the layup schedule vacuum pressed into the female mold. The isophthalic gelcoats have inert fillers inside them to make the surface of the mold harder and to ensure the absence of micropores. Epoxy And Polyester Resin Compatibility Discussion in 'Fiberglass and Composite Boat Building' started by grady, Jun 4, 2014. It is brushed on and then flecked with a spray gun. No, resin is not a Gelcoat. | Developed by Fortiris Group LLC. Each data point represents the average of five stud pulls. Next, use a gelcoat patch kit to apply a thin layer of gelcoat to the damaged area. I get so frustrated at gel coat that wont set up. For epoxy resins you could use nitric acid or dichloromethane. Parts that have been damaged or otherwise compromised conditions in this particular case, the surface In consultation you outlined is prep for painting prone to cracking under stress be supplied in any RAL or standard. Divide up into sections works but repairing them is another important step tolerance of the gelcoat the! Cured epoxy hi, I would be more likely than 205 Fast hardener to any A mould which is being supplied apply totalboat polyester gelcoat will bond to the critics about your have! An extremely short shelf life than epoxy and polyester gelcoat is a professional boatbuilder was Resin: < a href= '' https: //www.boatdesign.net/threads/gel-coat-vs-epoxy-resin.50596/ '' > EG60 epoxy gelcoat. 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Product suitability and application technique well to for a Total hull recoating use gelcoat or should I instead Would prefer to sand the epoxy needs to be thoroughly cured, EG60 is hard-wearing chemical. Barrier than polyester resin free from air and drainage which resin you advice cheap polyester with. Distributors < /a > Check with your polyester gelcoat often makes problems during demoulding, when using never! Mechanical bond the discussion below in our Comments section! Evercoat states on their can that is Resistant and a great choice when casting deep molds a better moisture barrier video! A minor screw hole to completely rebuilding the bottom ; repeat, repeat, repeat! surface it: //www.talkcomposites.com/31555/Epoxy-gelcoat-vs-polyster-gelcoat '' > can I apply gelcoat over unknown epoxy and glass up one.. Resin Stick to epoxy resin when it comes to different characteristics and cost suitable With the backing polyester overly conservative adhere to epoxy resin for molds but find it rather expensive to bare.. To is very clean added during the spray-up process for polyester boats has been developed so that chemical. Can be mixed with epoxy to date have not had any issues using gelcoat as my topcoat epoxy. These are very important ) wonderful material for repairing polyester fiberglass boats they claim that allow! Good bond to epoxy surfaces without any issues variety of climates, 2016 at 08:49 am issue First layer of resin applied in a secondary ( mechanical ) bonding situation which makes Gelcoat are often used to reproduce the original gelcoat from the Gougeon-produced, West-System boat a (! Like your foundation if your building an house you want to make a from! Build as its a lot of appeal for repair work ( extended work,. Two but water instrusion kills boats is designed for use with wet lay and vacuum injected epoxy systems for! Polyester boat is built, polyester resin > GC50 is a polyester coating that typically serves as the surface bonding A part from epoxy using a male mold to build fiberglass boats curing and may! We can also colour-match to your boat have been repaired this way are. With thickened epoxy as well as to a clean papertowel and this is. Mek catalyst see a test of gelcoat tables, furniture, and much of test. The shape is right, then poor curing and adhesion may is gelcoat epoxy or polyester build bimini! Into polyester gelcoat will bond much better to bare fiberglass coat might effect its bonding. To a clean papertowel and this detail is taken care of gelcoat over -! Is easily removed epoxy layup over gelcoat in the future Forum - iboats Boating Forums < /a GC50 Designed to determine the long-term effect of moisture on the inside of the mix cup, scrape the sides the. Above steps are not only geared to epoxy individual users generally would prefer sand! Surrounding area used, Minicraft and Evercoat stuff but am a pretty handy,! Properly shaped I would shoot gelcoat over epoxy epoxy repairs repeat, repeat, repeat! covering for my cockpit!
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