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	title of this thread your message fibres is quite simple. Glass fibres do not connect with the polyester resin, so they are coated with materials that connect both to the glass and to the resin without affecting the polymerisation of the resin. Unfortunately these coatings are water soluble and through capillarity they will be replaced by mostly organic material that is present in the water. Hence the importance of gel-coat to protect the part of the fibre reinforced polyester that holds the fibre. The gel-coat has not the mechanical strength so it has to be combined with fibre filled material. There is simply nothing you can do, other than being careful with them because they have lost significant strength due to the fact that there is no link between the glass and the polyester. In sailboats this penetration of water is often referred to as glass fibre cancer. A small crack that is not immediately protected will quite quickly develop to a large patch. associated web images (optional) associated web link (optional) your email your password create a forums account \| you forgot your password?