We use SEM seam sealer I believe the part number is 39377 about any auto body supply shops carry it.
Hope that helps! I agree about staying away from fast and firm, its junk.
A big thank you to the guys who use this stuff everyday for helping me out with product knowledge. It would seem like a simple thing to get a tube of seam sealer and go to town... it ain't.
I have a autobody mailorder catalog in front of me, there are at least 7 different seam sealers in 3M alone, not including SEM or Fusor or the off-brands. There's automix, duramix, single tube, sprayable... I'm sure I would have mistakenly picked the fast'n firm and suffered.
You guys who share your hard earned knowledge are part of what makes this forum such a strong community.
Jeff-
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You remind me of the timing on a turbo engine...