after 12 months I finally fixed my front fender at 2:30 this arvo with some polyester resin. The underside is fully hardened from what I can see. It's now 6:30pm here. Is it ok to put resin on the top side now (against the resin I put in this arvo) or do I have to wait longer?

I have a fibreglass handbook, but do you think I can find a simple answer in that?!

It's ok with polyester after the heat is all gone and its hard, a good couple of hrs depending on many things... Make sure you sand it well and all will be good.

ta mate. I thought so but I wanted to make sure.