The key is in the order of mixing and reducing the possibility of reacting the OP before it gets into the UPR. Do not mix more resin than you can practically use, work in smaller more manageable amounts if necessary. In this tutorial, we will show you two recommended techniques for measuring and mixing epoxy resins by weight or volume. not mixed correctly this will occur under cured section throughout the resin. The % listed is the minimum and must not be decreased to give more working time. Mixing out of the above range will result in a weaker cured resin. In colder working temperatures you may wish to increase the catalyst addition to 3% but definitely, no more than 4% to speed up the curing process. Since these products are mass exotherm sensitive, mix small fresh batches and keep a wet edge. It will harden, stain, and destroy the floor. And epoxy resins are measured by volume. Epoxy resins can be measured by weight, but due to the nature of specific gravity of the resin it is important to Less MEKP gives a slower cure, more gives a faster cure. Generally speaking, for Polyester Resins, the mixing ratio is 2% i.e. of MEKP to 1 gallon of polyester resin. Polyester is catalyzed with MEK-P with a ratio of a few drops to an ounce or 30 mils or greater. Use an MEKP dispenser, measuring cup, or for quantities lower than 3cc, use a syringe. The cure of the resin will begin as soon as the catalyst is added, and the speed of the reaction will depend upon the particular resin and activity of the catalyst. The mid point of 1.5% is most common. 4. 20ml for every 1kg of Resin in working conditions at room temperature.For the Water Clear Casting Polyester Resin, this drops to 1.5% or 15ml for every 1kg.. Depending on the amount of resin needed, pour the appropriate ratios of polyester resin and MEKP into a heavy-duty plastic tub or bucket. As a rule of thumb, it’s best to add the OP last and mix it thoroughly. I also scaled the catalyst way back . epoxy is normally mixed with a hardener in a 1:1 up to 5:1 ratio of resin to hardener. Measuring and mixing epoxy resins accurately and safely is an essential skill for any resin user that wants to stay healthy and have great results with their project. Polyester resin is a much cheaper resin with quite different properties from epoxy. The Basics Choose Your Resin For this demonstration, we are using our Super SAP CLR epoxy resin … I mixed up 1/2 gal poly resin for a deck job, mixed it for about 30 seconds max and poured the whole lot out of the bucket onto the deck. Unused resin in volume will cure and an exothermic reaction will occur. Mix the polyester resin with a catalyst named methyl ethyl ketone peroxide (MEKP) to begin curing. 3. Pour the polyester resin … The last thing you want is to overfill a container and have fiberglass resin hit your floor. The standard ratio is 1 oz. Re: Chart for poly resin cure times vs. temp vs. MEKP? Mixing for longer than that or leaving it in the bucket spells doom. The mixing of organic peroxides (OPs) into unsaturated polyester resin (UPR) can make a critical difference between a good part and an increasing scrap rate. Amount of Gelcoat or Polyester Resin w/o Wax: Quantity of Wax Additive Required: 1 ounce: 20 drops: Avoid using too much wax as it will result in fish eye and other undesirable results. For this reason, it is important to use a tarp, plastic sheet, or newspapers to protect the floor or table where you are mixing the fiberglass resin. Polyester & VinylEster Resins: Mix and measure accurately according to the chart below. The chart below indicates how much additive to add to wax-free gelcoat or polyester resin. Trojan Fibreglass uses two methods for mixing ratios, all polyester and vinylester resins are measured by weight. Sometimes here at work we will mix up small batches of gelcoat to fill air bubbles or other defects at about 5%.
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