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Old 08-20-2007, 02:10 PM
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Sealing Around Lap Welds

I'm patching in new pieces of sheet-metal to replace the rusted out portions. I'm butt-welding as often as possible, but there are some areas where I simply have to lap-weld a patch in.

For the lap-welded patches, I need to seal around the edges of the unwelded sides to prevent moisture from getting in. What are good products that can be used as either a brush-on or squeeze-in sealant?

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Old 08-20-2007, 08:30 PM
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I've used Eastwoods Seam Sealer, the brush on type and have had good luck with it.

Paul
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Old 08-20-2007, 09:28 PM
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If this is in a boxed area that can't be cleaned for primer application then you're best off coating with a cavity wax type spray-3M's rustfighter, Amsoil HD-MP, or Transtar Amber Coating, Cosmoline...

If you have access to the backside for cleanup you can coat the area with epoxy primer then seamseal with a quality sealer like 3M Ultrapro URETHANE seamsealer, or Fusor or Transtar equivalent. Heck, even roofing tar has also been used for years-anything that will protect the metal and not dry up and crack later to hold moisture.

Stay away from the older solvent based seamsealers-they shrink, harden and crack with age and have caused the death of quite a few cars over the years.
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Old 08-21-2007, 05:59 AM
F&J F&J is offline
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Heck, even roofing tar has also been used for years-anything that will protect the metal and not dry up and crack later to hold moisture.
Asphalt based roofing tar can be thinned with mineral spirits so it flows better into the joints. After that sets up a bit, then coat it with un-thinned tar.
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