trailers: fiberglass vs. metal

"Shawn" sdotherecurry@bresnannextdotnet wrote:
Some claim UV light can penetrate a fiberglass top and that the
accumulated irradiation of the glider will cause damage to the ship. I
used to fly at Boulder, CO where all of the trailers are parked oriented
nearly east-west exposing a long southern face to the Colorado sunshine.
Trailers occupy the same spot for years on end, and, not that I've taken a
poll, but I've never heard of any ships with damage to the top of one wing
and the bottom of the other, or one side of the fuse or fin due to a
fiberglass top.

Could it be because sun in Colorado in summer shines straight DOWN?
Seriously though, can fiberglass top be painted with aluminum silver (inside
or outside) for added UV protection?

Shawn
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