.. One of the problems with
purchasing a US glider is that there is no experimental
class so that limits me to unmodified gliders that
have an approval in Canada.

I'm surprised by that statement. My LS-4 is rated Experimental,
purchased in the US and never questioned.

BTW, I've logged over 400 hours in this ship and love its every
attribute. Sure, the gel coat shows some checking, but knowledgable
people have assured me it in no way affects performance, and I haven't
noticed any changes, myself.

One suggestion. Wax the wings heavily and maintain the wax coat with
re-waxing several times a year. Besides UV deterioration, gel coats
fall apart due to moisture migration and regular waxing stops (or
nearly stops) both kinds of deterioration. I use paste wax for
durability, and this year I started with mold-release wax for a super
seal. It doesn't polish to a very high sheen, but it's tough stuff, and
sure seals the gel coat. Then I finished off with a second coat of
standard past wax.