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Inventor has GFRP (Glass Fibre Reinforced Plastic) which may be of some use to you, I'm not well up on the physics of the materials so don't know how similar it is to GRP.
do you realize the question was asked 2.5 years ago? (I'm guessing Richard is no longer expecting/waiting for an answer here...)
Sam M.
Inventor and Showcase monkey
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Sorry didn't spot the date on the post