Read the directions on either product as you do not want to get it on your skin (takes 2.5 months to wear off, ask how I know

). Do not think it will harm the fiberglass. As for curing and a proper finish for the raw glass work, your local Finishmaster will have gelcoat in liquid form, as mentioned above, this is the top coat before you do any paint prep (sanding, priming, painting). Without the gelcoat over your raw fiberglass you do run the risk of moisture working it's way between the layers of fiberglass and resin. This will cause bubbling down the road and eventual failure of the fiberglass matting, so do not skip this important part of the build up.
Bill S.
Sorry for your loss of friend Mike McGee, Shine. Great trans men are few and far between, it seems. Sadly, Mike Frade was only 66 and had been talking about retirement for ten years that I know...
We Lost a Good One