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Old 05-13-2011, 05:10 AM
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Fast & firm is a good sealer for most seams but drip rails are just too much for it,if put on too thick it skins over and cracks or never dries...theres nothing wrong with your prep...You'll need something more rubbery (flexable).
I cant remember what Ive used in the past but someone can give you a brand name , if not your local paint supplier can help....

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Old 05-13-2011, 07:56 AM
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I haven't used it on the drip rails yet, but the places where I noticed it was cracked was in the seam along the inner wheel house and trunk floor, and in the back along the rear trunk brace where it met the tail light panel. Keep in mind the car is just a rolling chassis and sits in the garage. However, it is perfectly intact in other places, like along the exterior seam of the cowl where it meets the firewall.

The 3M brushable seam sealer I use also is cracking in some places too, which doesn't inspire confidence in its long term efficacy...
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Old 10-16-2017, 06:38 PM
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The post here have me a bit confused. I need seam sealer for my floor pan install on my Porsche 356. I don't want to have to buy a new mix gun because I do this as a hobby and it will turn to rock by the time I use it next. So standard caulk tubes or brushable would be best for me. I have used Wurth brushable and some 3M called Dynatron. Don't want to cheap out and use a product that will shrink and crack because it is made poorly to be cheap. What do you guys recommend for long term? I need both caulk tubes and brushable because all areas are not accessible with just the caulk tube. Thx Mark
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Old 10-17-2017, 05:44 AM
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I use the brushable too. Just don't put it on too heavy if it cracks let it dry completely and give it another thin coat to fill in the cracks. I always apply it and smooth it out as I go with a small bondo squeegee I cut down then wipe it smooth with lacquer thinner it looks great. I'm using SEM seam sealer now it seams to work well and the price is reasonable. If your working newer cars you really need to use what the manufacturer recommends
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Old 10-17-2017, 07:38 AM
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I had a thought. something else that might cause some cracking is if it was painted first. prime it but don't paint it before seam sealer.
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