Hi guys...I'm messing around with hand layup of twill carbon in a complex three part mould. The three parts are laid up seperately and then joined with an inflation bladder. There is an advantage for me in letting the parts cure to B stage (not sure wha range of cure that covers) and then joining with fresh uncured epoxy. The question is what state can you let epoxy cure to before it needs sanding for good adhesion and what is the chemical process that stops expoxing adhereing well once cured?
Cheers...Chris