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A professional was employed who had all the experience and tools needed and soon had the grp cut away. Underneath was a solid block of what looked like cement which explained the lined hole. This gave a solid foundation for the repair and solved the potential problem of keeping the bolthole clear of resin. The 'cement' block turned out to be a mix of resin and microballoons which are a grey powder before mixing.
A resin and glass mix was used for the repair to make a solid block to tighten the new bolt down onto. Because of the thickness of resin needed it was applied in two stages. In the first glassing the mix was pushed out under the edges of the grp and the block was covered.
This was left to cure completely before the second glassing was done.
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