Re: Using brush instead of spray for gel
Just be careful with the glue/acid brush -- they shed bristles very, very easily. Nothing worse than trying to dig bristles out of wet paint/gelcoat.
A foam brush will work, but I really prefer the control you get with a real bristled brush. If you're willing to part with a couple of bucks, grab an artist's brush at Michael's or some other hobby store.
I never found waxed gelcoat a problem on it's own, but given a choice I'd go with unwaxed. You can air inhibit it with PVA or plastic, or if you know you're going to be building up a couple of coats you can just let it set and apply your second coat without having to scrub and sand.
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'85 BYB Vagabond 39