I have two fiberglass/resin projects for which I'd like to have some
material recommendations:

1) A 1980s semitransparent fiberglass hatch whose top side is
worn/weathered, so that it is rough and fibers are sticking out. I
would like to coat the surface with something that will give an even
surface, cover the itchy fibers, and maybe even bring some of the
transparency back to the now 'frosted' hatch.

2) The top of the companionway hatch has a thin wood layer, wider
stripes of teak with thin stripes of lighter wood in between. These
woods apparently have different heat expansion, varnish will last a few
weeks before it splits at the seams, i.e. everywhere.
I had planned to put some resin on top of that wood, hoping that it
would be more stable than varnish. Maybe a thin glass fiber layer also.
Is the glass fiber necessary?

Which resin(s) would be best for these applications? Both are on deck
in bright sun, both need to be transparent, and create a smooth
surface.

Thanks!