How To Mix Gel Coat With Hardener, Pour the amount of gelcoat that you estimate you'll need for the project into an unwaxed paper cup. Poly products need to be sealed from air to fully cure. THE RATIO IS APPROXIMATELY ONE OUNCE OF HARDENER PER GALLON OF RESIN. Ensure proper curing with ChemCalc's free MEKP calculator. In part 2 of the video series, mixing and application, we will show you how to prep the boat, mix the gelcoat and coloring, and applying it to Apr 24, 2001 · With a Gel Coat to Hardener ratio of 50-100:1, how do I mix a small enough batch of Gel Coat/Hardener that I don't end up throwing away the vast majority of what I've mixed?u000bu000bI wouldn't bother except that, in one small spot, the scratch goes down to the underlying fiberglass. Mix and catalyze correctly: Measure MEKP accurately and mix completely to avoid curing problems. Read the pro guide. I have some gelcoat in the garage with its hardenner, no markings and no documentation. ) Add a few drops of MEKP (methyl ethyl ketone peroxide) hardener to the cup of gelcoat. 025” wet thickness. For Vinyl Liner: Vinyl patch kit with waterproof glue, wall foam, liner lock. 2% to 3% will give you the proper cure rate. The box contains fiberglass resin, resin hardener, an applicator brush, mixing cup and sticks, and a generous quantity of fiberglass matting. Bondo® Filler Types and Uses Bondo® Original Filler Ready Mix Pouches Convenient ready mix pouches which means no need to measure filler and hardener Two-pack of pre-measured, two-part formula saves time and eliminates guesswork Original two-part hardener to repair dents, dings, and scratches in your home or on your car Jul 17, 2012 · Gelcoat Color Match Chart Our Gelcoat Color Match Chart is the perfect solution for any boat repair project. (Waxed cups tend to release the wax into the mixture when the gelcoat is stirred. 5cc or 40 drops of hardener I don't know how cold it is up there, but if it is cool you might want to go 46 drops of hardener Reply Like 10-01-2012 | 10:50 AM # 5 paraman Senior Member Joined: Nov 2003 Posts: 997 Likes: 152 Received 19 Likes on . I realise it may be useless but want to mix a sample. DIY vs. Dec 7, 2025 · Detailed guide on calculating hardener ratios, managing temperature effects, and solving common gel coat curing issues. and gelcoat needs twice as much catalyist. For Fiberglass: Fiberglass repair kit (resin, hardener, cloth, gel coat), acetone, polyester putty. Generally speaking (and depending on the temperatures) a catalyst ratio of between 1. Learn exact MEKP ratios, temperature adjustments, and measurement techniques for a rock-hard finish. DIRECTIONS FOR POLYESTER HARDENER POLYESTER RESIN/GELCOAT IS CATALYZED WITH MEKP (METHYL ETHYL KETONE PEROXIDE). Master the science of mixing gel coat. Bought from a fibreglass supplier at a boat jumble some years ago. Dec 5, 2025 · For Concrete/Gunite: Plaster patch mix, 2-part epoxy pool putty, bonding additive, muriatic acid (handle with extreme care).
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