I've been using Silmar 41 for years with no problems. At least no problems curing. It cures with heat but too much heat and it gets brittle. I use 3 drops of catalyst per ounce of resin. I stir until it turns a greenish blue tint, then add the color dyes if coloring. I let it set for 24 hours before even attempting to use it. I usually use a pressure tank and set it in a warm place. If your shop is cold, hang a clip on light above the cup of resin prior to adding the catalyst, to warm it up and thin it out a bit. It will mix much better and air will escape faster. The colder the room the slower the cure. Almost all of my casts come out tacky. That's just a property of poly resin. I let it set in the sun for an hour or just let warm air get to it for a little while, and the problem is fixed. I would not recommend using the kitchen oven but that's just me. If they get brittle they'll shatter real easy. Some color agents will soften the resin like oil based paints. When that happens I add a couple extra drops of catalyst to the cup of resin. ( not the ounce ). Hope this helps. Good luck, John
