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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Old glass fibre tanks
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<blockquote data-quote="timetraveller" data-source="post: 9596" data-attributes="member: 456"><p>Regarding Phil's worries about epoxy and polyester resins not sticking to each other; my understanding is as follows. If you have old polyester resin products, e.g. old petrol tanks, then there is no problem getting epoxy to stick to the old material provided that it is very clean and well scuffed. There lies the problem. How do you do that on the inner face of a fuel tank? It is a recognised repair method for old GRP boats where the material is accessible and can be cleaned easily. The problem arises if one tries to attach an epoxy layer to a relatively new polyester product. New in this case means up to a few weeks old. The problem is that the styrene is still slowly coming out of the new product and it is this release of styrene which causes the potential bond to fail. To give you an example know to me personally so that there is no intermediate exaggeration; I used to know some chaps who built 35 foot catamarans. Their factory was not large enough to make the whole of the deck moulding, 35' x 20', in one piece and so they made the deck in smaller parts and then used epoxy resin to 'glue' the parts together. All the case I have seen have failed across the joints. It makes problems with tanks seem quite trivial doesn't it? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown :(" loading="lazy" data-shortname=":(" /><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite5" alt=":confused:" title="Confused :confused:" loading="lazy" data-shortname=":confused:" /><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" /></p></blockquote><p></p>
[QUOTE="timetraveller, post: 9596, member: 456"] Regarding Phil's worries about epoxy and polyester resins not sticking to each other; my understanding is as follows. If you have old polyester resin products, e.g. old petrol tanks, then there is no problem getting epoxy to stick to the old material provided that it is very clean and well scuffed. There lies the problem. How do you do that on the inner face of a fuel tank? It is a recognised repair method for old GRP boats where the material is accessible and can be cleaned easily. The problem arises if one tries to attach an epoxy layer to a relatively new polyester product. New in this case means up to a few weeks old. The problem is that the styrene is still slowly coming out of the new product and it is this release of styrene which causes the potential bond to fail. To give you an example know to me personally so that there is no intermediate exaggeration; I used to know some chaps who built 35 foot catamarans. Their factory was not large enough to make the whole of the deck moulding, 35' x 20', in one piece and so they made the deck in smaller parts and then used epoxy resin to 'glue' the parts together. All the case I have seen have failed across the joints. It makes problems with tanks seem quite trivial doesn't it? :):(:confused::eek: [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Old glass fibre tanks
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