70sBulRacer Posted September 22, 2023 Report Share Posted September 22, 2023 (edited) Hello all, new to the forum here. I raced Pursangs as a teen in the late 70s, and I’ve recently purchased a Bultaco project. The bike has never been repainted, and the color is molded into the gelcoat on the tank. The tank has many stress cracks in the gelcoat. I plan to coat the inside of the tank with one of the tank sealing products on the market. For the outside of the tank, I’d like to just clearcoat over the original gelcoat to protect it and seal the cracks somewhat. Has anyone done this? What do you Bul experts recommend? Edited September 22, 2023 by 70sBulRacer Clarify Quote Link to comment Share on other sites More sharing options...
stpauls Posted September 22, 2023 Report Share Posted September 22, 2023 Tank sealers: I've used Kreem. Rubbish - failed within weeks. Flowliner. Failed after 2 years. This was despite draining the fuel tank after every trial. Quote Link to comment Share on other sites More sharing options...
sherpa325 Posted September 22, 2023 Report Share Posted September 22, 2023 Originally Bultaco tanks had no sealer of any description from the factory and they never had an issue. The problem today is ethanol in the fuel, as it really attacks fiberglass. Caswell seems to be the most widely used by all of my friends. My tanks are all sealed with a cup full of colored resin and I've had no issues but I don't use ethanol based fuels. Regarding the stress cracks in the original gelcoat I think that's a much bigger issue and can't see a clear gelcoat solving the issues, I would be more inclined to sand al the stress cracks out and apply another original colored gelcoat. Non of this is really expensive just time consuming 2 Quote Link to comment Share on other sites More sharing options...
brt650 Posted December 31, 2023 Report Share Posted December 31, 2023 On 9/23/2023 at 9:54 AM, sherpa325 said: Originally Bultaco tanks had no sealer of any description from the factory and they never had an issue. The problem today is ethanol in the fuel, as it really attacks fiberglass. Caswell seems to be the most widely used by all of my friends. My tanks are all sealed with a cup full of colored resin and I've had no issues but I don't use ethanol based fuels. Regarding the stress cracks in the original gelcoat I think that's a much bigger issue and can't see a clear gelcoat solving the issues, I would be more inclined to sand al the stress cracks out and apply another original colored gelcoat. Non of this is really expensive just time consuming Mmmmm sherpa325, Is it possible for you to list your" all of my friends" please? Its not that I doubt what your saying,its just id like to check up with all of them. Cheers Brt650 Happy New Year everyone Quote Link to comment Share on other sites More sharing options...
sherpa325 Posted December 31, 2023 Report Share Posted December 31, 2023 A day ago you would have been on that list Brt650 2 Quote Link to comment Share on other sites More sharing options...
sherpa325 Posted December 31, 2023 Report Share Posted December 31, 2023 On seconds thoughts, you wouldn't have been on there yesterday either Quote Link to comment Share on other sites More sharing options...
brt650 Posted December 31, 2023 Report Share Posted December 31, 2023 You don't know how happy that makes me feel 2 Quote Link to comment Share on other sites More sharing options...
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