Gelcoat Mixing Calculator, Enter how much resin you are mixing and your shop temperature, and the calculator gives you the dose in cc and fluid ounces, adjusted for the weather, so your batch gels on time and cures hard. Gel Coat MEKP Catalyst Calculator Get the right amount of MEKP hardener for your polyester resin, vinyl ester, or gelcoat. Most gelcoat manufacturers recommend catalyst percentages between 1% and 2% by weight. A higher speed might be needed for the first 3 minutes to get material moving, then a lower speed, so that there is just. The correct mix ratio is critical to ensure proper curing, strength, and finish quality. This will affect proper Gelcoat and Resin curing times and properties, especially when Gelcoat is catalyzed over 3%. Below are two free mekp calculators and a mekp chart. The Gelcoat to Catalyst Ratio Calculator removes guesswork and helps you mix with confidence. Home How To & Tools Gelcoat Volume Calculator Gelcoat Volume Calculator Below are two gelcoat estimators for calculating the amount of gelcoat you will need. Ensure proper curing with ChemCalc's free MEKP calculator. m5, w775k, nw4cjd, gaud, tvvl, dsvrzt, ctubx, nb3, 7whak, c1tcshl,