There is a 'fiberglass safe' aircraft stripper - I have not personally used it, but when I was painting my Integral at a friend's place, another guy was making some repairs and said he used it with no problems on composite airplane parts. Of course I know how meaningful the 'I know a guy who...' posts are
http://www.amazon.com/Fiberglass-Str.../dp/B000VHVJOI