Yes I added a small amount of 407 with the epoxy during the lay-up of the first layer it helps stiffen the lay-up and fill any small holes in the foam. My NA recommended it. I made a few test panels and the panel with 407 mixed in was much stiffer then straight resin. Epoxy resin is slightly elastic and the bog helps make it stiffer. The amount of 407 is slight is not like I’m making a filler paste to a peanut butter thickness. The lay-up was vacuum bagged with two layers of the 200-gram carbon unidirectional cloth. Why do you seem so against it Robert?

I use 4 people for the lay-up of a 20-foot by 3-foot area with 2 layers of cloth; peel ply, bleeder cloth, and vacuum bag on a female mold with compound curves. I live in south Florida so the temperature and humidity is high. I use West Systems with the tropical slow hardener and it takes us about 2-3 hours to do the complete lay-up. We hand squeegee each layer of cloth to make sure it is saturated, the epoxy is worked through, and excess removed. Usually I have two on the lay-up and two mixing. The key is get it laid out before it starts to gel so the vacuum bagging will be effective. Your environmental conditions and speed of your hardener determine your working time. If you need help it is best to get somebody to be mixing small batches of epoxy for you and keep them coming. Yes it wears you out but with my team of 4 we cut through it pretty good and have time for beer afterwards.