ivark wrote:
Thats weird, I had a SF25C with 65hp engine and it took off and flew quite OK in the rain..
You have 20 more hp than the SF25B I flew.
I try not to take off in rain with composite or wooden propellers, and generally I like to keep tip speeds down in rain (by limiting rpm). Our G109B composite prop is somewhat eroded and we think it is by rain. But we do not know for sure and I do not really have a good source for this.
huv wrote:
Our G109B composite prop is somewhat eroded and we think it is by rain. But we do not know for sure and I do not really have a good source for this.
Probably chemical reasons, like acid rain for composite frame over cities/land or salted water for seaplanes over lakes/oceans?
Sports composite cars are left all year around outside in rain+sunshine, at best you will loose the paint or at worst the whole car 
I doubt any of that is mechanical
