Thanks Rodney, I appreciate the feedback. The OP simply stated if he needs to follow the directions on his packaging and we tried to give him the answer and reasoning behind it. Unfortunately RCU is famous for guys with limited experience wanting to argue points without fully understanding the situation. West epoxies are formulated for cold cures because they are intended for boats that may still be in the water or not able to get to a warm environment. Hobbyists like it because it is user friendly and it does the job. My last race airplane would not be the same if it was not built with materials and knowledge that go beyond common hobby. It has 520 sq in of wing, weighs 6.25 lbs and is powered with a YS 115. First off the weight would be almost impossible, the engine weight is 1/3 total aircraft weight. Figure in radio gear, retracts, 16 oz fuel tank, full paint job and you can see what I mean. The fuse is laid up using a surface layer of 2.4 ox cloth followed by a layer of 6 oz cloth with 3K CF tow between the layers in the nose and wing TE. Thats not a lot of material there yet the airplane does an honest 160 mph and will do a 180 degree turn in 50' dia. That is right around 20 G's. The fuse also has no formers, not even a firewall. What makes it work is that I used Hysol 9396 resin and then post cured the fuse at 180 degrees for 2 hours following an ambient cure of 48 hours. Once you have the knowledge of composites you will find areas to use the knowledge.