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I personally wouldn’t be afraid of using bondo if it sticks good to your project, cars get wet don’t they? and a gas tank isn’t going to be submerged in water anyway. I think there are some types of marine fillers but I have used regular bondo on an outboard before and it was never a problem. If someone tells you not to use it what do they tell you to use?
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John, I have used it on a bunch of motors without any problems.
On deep dents I use JB Weld as a base, then I put a thinner layer of Bondo on top.
After the Bondo, I use glazing putty on any of the small imperfections.
Bob D1 user thanked author for this post.
John,
If you want to use any filler first try to straighten the metal to avoid thick applications of filler. I have done many boat fiberglass repairs. I would use epoxy sanding resin & powdered fiberglass cloth to mix a putty type mix & apply. Use acetone to clean tools. Another thought with all the new cars with aluminum body panels there must be new products to use now for aluminum apps. Like others have stated epoxy type fillers would work too. Just straighten the metal as much as possable first & keep the filler thin to avoid cracking out. Be careful with fiberglass resin mixing the hardener, too much & the resin WILL catch on fire. I know from experience & air tempature changes mix ratio. Ive cut boats in half & reglassed for repairs, Look on line fir Filler products possably. Photos of your repairs would help & wear a MASK!! Your lungs were made for O-2 not filler dust please!
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Bondo does absorb water. Use Evercoat F27 will not absorb water. Or epoxy.
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for small surface dings I used JB stuff ..get rock hard sands like anything else prep the site and clean it first
Joining AOMCI has priviledges 🙂
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