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Old 05-10-2007, 01:01 PM
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Clear problems with gas fumes

Anyone here paint motorcycle tanks and experiencing problems with paint lifting around the gas caps? I've been trying different urethane clears over the last few years and the latest, DuPont G2-4500S, appears to be the worst yet.
About 2 weeks cure time since painted and then installed on the bike, didn't make 24 hours and the paint is lifting around the gas cap! I don't know what they are taking out of the clears these days to meet EPA regulations and I do know our local gas has 10% methanol. I suspect both issues are at play. My local DuPont dealer is researching the problem, they are the ones who recommended I try the G2-4500S to hopefully avoid the problem.
Interested in hearing any feedback. I need to re-do the paint but of course don't want the same problem a second time. I've been painting for about 35 years but as of NOW bike paint jobs are off my plate.

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Old 05-10-2007, 01:16 PM
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This has nothing to do with the clear as gas will not have any affect on a good Urethane or Polyurethane clear once cured.

Depending on the design of the motor cycle tank and one is Harley's, the fumes of the gas is creeping under the paint.
Not all cycle tanks have this problem but to correct the problem some bike painters will coat the edge of the paint at the filler with fingernail polish, some use epoxy at the edge and some just tape the neck different.

Hopefully one of the cycle painters on here will give you different ways to fix the problem and tell you what type of tanks are an issue to be concerned about.
Mrclean is sometimes on here and he is a national bike winner and can tell you if you PM him.
Or punch in Extreme creations on a search engine to reach him. He will help.
Edit-found it.

Last edited by BarryK; 05-10-2007 at 02:07 PM.
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Old 05-10-2007, 04:49 PM
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Bob and Jim just described this in a recent thread. Try this link
prepping a motorcycle gas tank....
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Old 05-10-2007, 07:13 PM
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on the harley tanks i have painted ,after i put the last coat of clear down i allow it to tack up but not long enough to dry and then i take my striping brush and dip it in my leftover clear and paint a nice little bead around the edge of the clear around the filler neck and i have had no problems (knock wood) and i do this on all tanks just as a precaution . cause as we all know re-does suck outloud lol . so give it a shot and good luck to ya fisher
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