On Friday, 8 January 2021 at 17:20:57 UTC, wrote:
I used a meguiars wax spray Ceramic and am very happy with the results. Works differently then silicones.

Nobody is questioning the efficacy, either on cars or on gliders.
My warning was about difficulties with subsequent repairs on fibreglass or gelcoat (as in gliders).
But I could be wrong. You may feel it's worth the risk. Or you could take the advice of your local friendly glider repairer!
J.