No reason to put resin on after the Bondo putty stage, just use a 320 grip sand paper on the whole helm to smooth out the rough sanding marks, clean off the dust real well... then just prime and paint.
This is a rough sketch from memory, the detail shap is not correct, so don't print and use it as a pattern or anything... but this is approximately how I did mine...
1.) drew the brim shape onto paper, then drew the detail stencil inside the brim outline
2.) cut the brim detail out of a piece of material with some thickness... a plastic "For Sale" sign, foam board, card board... whatever like you can find
3.) glue this to the underside and fill in the edges with a bit of putty, glaze, hot glue... just remember it has to be paintable, most bathroom caulk is not.
4.) prime, and paint....