Hey guys let see if you can help me, I am trying to skinned a product, with carbon firbre, I was told to add catalyst to epoxy. Do this really needed? what is the sense of adding catalyst to epoxy if the epoxy is a laminar glue

It's a slight subtle difference in the chemistry.  It is worth people understanding.  With a catalyst based reaction, you can to an extent control pot life/cure times by varying the catalyst quantity (subject to adding the minimum obviously).

Where as with a non-catalyst based resin such as epoxy, varying the quantities of "hardener" or "part B" won't speed up the cure, it will just leave you with uncured resin in the laminate.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant