Per Dane:
Hmm, why not just use the 207-hardener (has UV-filters in it), and/or a
lacquer with uv-filters in it?

If you want it to be coloured, like it would with a non-see-through
tape, why not just paint it?

I want to be able to check up on a suspect area underneath it without sanding
off paint/gel coat.

Actually, the alternative hardener is sounding pretty good.
--
PeteCresswell