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Old 12-25-2019, 06:33 PM
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seam sealer

Did a search and there is lots of info on seam sealers such as 3M and Eastwood. Noticed the prices was around $16 and up for a tube.


Also noticed that Lowes sells a Polyurethane sealer (exterior, paintable) for around $6.



In my search there were people who complained about 3M not drying and others cracking so it appears automotive seam sealers can have problems too.



Can anyone shed light on why to use automotive rather than home sealers?

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Old 12-25-2019, 08:37 PM
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I have used the stuff at autozone, with no problems. I am sure there is some difference,not sure what,,,other than price. Maybe solvents amount of VOC or if it causes cancer in california rats.
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Old 12-25-2019, 10:23 PM
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First off, what quality of seam sealer are you after? The "tube" is going to be 1k, not very good, lowest of the list. You want 2k for real quality. In the auto body industry today, you will never see 1k used, it is history.

There are places it's ok but honestly 2k is the only way to go. Here is a little article I wrote years ago on the subject. The part numbers may be out of date but it will give you the "Basics of Basics" on the subject.

Seam Sealers - Autobodystore

Brian
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Old 12-26-2019, 07:57 AM
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Thanks for the input Brian. Let me give a little insight into what I'm doing (should have done this in the first place). In the process of making rear tubs for my '39 Chevy. This means there is no need for "factory' look, just a functional sealer that can be painted over and not shrink or crack. I watched an Eastwood video on the 2k and I think that will not work for me because I have to do the under side of the wheel well. Their 2k is "self leveling" which means it's runny until it sets up. Like pushing a rope around town.



My requirements are a sealer that will adhere, not shrink, not crack, accept paint and stay. Newer car repair or restoration should indeed use the correct product but I don't have crush zones and certainly not worried about show judges.



Will a door and window sealer do this job?
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Old 12-26-2019, 11:43 AM
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Quote:
Originally Posted by 39 master View Post
Thanks for the input Brian. Let me give a little insight into what I'm doing (should have done this in the first place). In the process of making rear tubs for my '39 Chevy. This means there is no need for "factory' look, just a functional sealer that can be painted over and not shrink or crack. I watched an Eastwood video on the 2k and I think that will not work for me because I have to do the under side of the wheel well. Their 2k is "self leveling" which means it's runny until it sets up. Like pushing a rope around town.



My requirements are a sealer that will adhere, not shrink, not crack, accept paint and stay. Newer car repair or restoration should indeed use the correct product but I don't have crush zones and certainly not worried about show judges.



Will a door and window sealer do this job?
My concern would be how well it stands up to wet car paint (will the solvent lift it?), how well it adheres to car primer, how well it withstands stone impacts, and will car paint stuff stay stuck to it upside-down. FWIW, at the shop where I work, good quality 1K urethane seam sealer is fine inside tubs. Always has been.

The home stuff would have to be like a fifth the price for me to want to consider it, and it wouldn't go on my car.
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Old 12-26-2019, 04:58 PM
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Here's what I use, works fine no cracking. You just have to let it dry, before applying sealer primer. Just like paint as far as solvent base. Solvents need to evaporate before overcoating. After primer sealer, I used a putty knife to lay on a coat of reinforced roof cement totally cover tub splice. Then when that set, I sprayed aerosol undercoat over complete inner tub . That matched original coating texture.
In trunk I just blended out the seam sealer with a rag soaked in naptha, primed, then used trunk paint to hide the sins.
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Old 12-26-2019, 05:08 PM
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Have to say I really like SEM seam sealer. Have used it twice now on kick panels and a tailgate. Very nice stuff. Be sure the read the instructions twice! You can also buy extra nozzles on Amazon.



https://www.amazon.com/GooChan-20-Pa...PFGW9ZWNTN3QM4
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