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Old 07-17-2006, 05:58 AM
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Seam sealer

When should I put on the seam sealer ? I'm thinking that I would put it on after everything is epoxied or would I put it on the bare metal then epoxy over it ?
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Old 07-17-2006, 07:03 AM
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I would Epoxy first, then put on the Seam Sealer-that way, should any moisture be present or get in the Seam it will not rust-
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Old 07-17-2006, 09:11 AM
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Big Dog, I am no expert on seam sealer but I will relate my experience with it (3M) when applied to bare metal. Some years ago, not knowing any better at the time, I applied the sealer to bare metal in the trunk area of my Mustang and over lacquer primer in the drip rail area that was applied directly to the metal on the roof, I now know not to use lacquer primer any more also After two years I striped the car again to do this right and what I found under the sealer was heartbreaking. There was HEAVY rusting under the sealer as if the sealer it self had attacked the metal ( ) and in fact this is something I have been meaning to ask about here. In the trunk area where it was applied to bare metal it had rusted even though it was not exposed to direct moisture and in the drip rail area, where it was over the lacquer, it was painted before exposure to rain but it was rusted anyway. It seems to me that at least in some cases it is possible for the sealer to actually cause rust if improperly used such as I apparently did, this was 3M seam sealer but I don't remember exactly which one.
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Old 07-17-2006, 01:06 PM
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3M did have some waterbased seam sealers out that came in a toothpaste sized tube, you can bet they may actually cause rust if used over bare metal. The stuff was junk IMO and reminded me of bathroom tile caulking.

Use a quality urethane or epoxy based seamsealer over epoxy or urethane primers and be done forever. Bob
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Old 07-17-2006, 02:18 PM
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Bob, The sealer I used was in a caulking type tube but it was very similar to what I also used from that "toothpaste" tube you described, probably the same thing just in a larger package. At this point I never apply anything to bare metal except epoxy and I tend to think of that as a "metal sealer" that will be a barrier of protection that will seal out moisture or just about anything else and everything after that then goes on top of the epoxy. I have found that once the epoxy is applied to bare metal it is then safe from rusting and one can then wet sand or do about anything you want without being concerned about moisture reaching the metal as long as the epoxy coating is not broken. Is this a safe way to do things or is there some products that should not be applied over epoxy?
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Old 07-17-2006, 08:26 PM
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I got some nice pictures of rust under sealer over an lacquer/etch primer on an 84 duelly if your interested.
This "factory procedure" has cost me a TON of extra work which would have been avoided with even just a quality sealer let alone epoxy under it.
Epoxy it first then use some of the badbob recomended 3M MSP in the caulking tube. If the epoxy is older than 24hr. I scuff it first with a red scotchpad just to be safe.
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Old 07-26-2006, 02:02 PM
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[QUOTE=baddbob]3M did have some waterbased seam sealers out that came in a toothpaste sized tube, you can bet they may actually cause rust if used over bare metal. The stuff was junk IMO and reminded me of bathroom tile caulking.

I have a used quart can of 3M Seam Sealer, and, I wanted more-I was in Denver last week and went ot a Auto Paint store and asked for 3M Seam Sealer. They brought out two caulking-type tubes of 3M brand Seam Sealer, and it said on the instructions that you could use a wet Finger to smooth out the Sealer, and that cleanup would be with Water-is this the bad stuff?

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Old 07-26-2006, 10:00 PM
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yeah, that sounds like the waterbased stuff
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Old 07-27-2006, 06:20 AM
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Even water based should be ok if applied over epoxy, or would it? That sounds like the same stuff I used but I had applied it over bare metal and lacquer primed bare metal (may as well have been bare with the lacquer primer crap )
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Old 07-27-2006, 06:54 AM
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O.K. then,

To the trash bin it goes! Thanks guys!
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Old 07-27-2006, 09:44 AM
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Look for a urethane-best IMO or an epoxy based seam sealer to avoid all the shrinkage and cracking problems that solvent based sealers have when aged. 3M, Fuzor, Rubberseal, Transtar and others have urethane and epoxy versions. The 3M MSP is the most toolable if you're looking to match a factory appearance.
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