Whats a good seam sealer... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mblackburnjr · 12-01-2011, 09:37 PM

Hey guys. I'm working on the cab of my 71 and was wondering if anyone can recommend a good seam sealer for the top and drip rails. I've read about the self leveling types. How exactly do these work? Are these sandable? Should i prime/paint(seal) before applying? The reason i ask is because i probly wont be painting the cab until spring...thanks in advance!

**LockDoc** · 12-01-2011, 10:08 PM

-
I use a 3M product called "Fast 'N' Firm". You should be able to get it at any automotive paint supply house.

3M™ Fast N Firm™ Seam Sealer, Part# 08505.

LockDoc

mblackburnjr · 12-01-2011, 10:16 PM

thanks Lockdoc...any tips on applying it?

**LockDoc** · 12-01-2011, 11:18 PM

Quote:

Originally Posted by mblackburnjr

thanks Lockdoc...any tips on applying it?

It's pretty straight forward. I cut the tip off small and do the narrower seams first and trim it off as I move up to the wider seams. As far as the drip rail it's easier with 2 people. One applying and one smoothing. Once you get an area filled, smooth it with your finger dampened on a wet sponge. That keeps the sealer from sticking to your finger. If you need to feather it out don't get any water where you need to thin it out on the roof metal.

LockDoc

black_sheep454 · 12-01-2011, 11:18 PM

3M fast and firm down the back sides and 3m self leveling on the flat parts, or do the top then roll the cab and do the back sides. The self leveling is awesome.
Posted via Mobile Device

**special-K** · 12-02-2011, 08:51 AM

I use lacquer thinner on a rag to smooth it out.

El Campo · 12-02-2011, 10:00 AM

Like he was asking do you do this AFTER priming/sealing or do you do on bare metal?
Posted via Mobile Device

Bert W · 12-02-2011, 11:16 AM

watching this one, on my to do list.

black_sheep454 · 12-02-2011, 11:21 AM

I like to do it after atleast a zinc rich or etch primer. If you do it over lawyer or urethane primer make sure it sanded good. And with self leveling seam sealer you don't have to smooth it out, it dies it itself.
Posted via Mobile Device

Rob H. · 12-02-2011, 01:00 PM

This post is just in time, needing to do this on my 72!

12-01-2011, 09:37 PM	#1
mblackburnjr collector of vintage rust Join Date: Apr 2004 Location: southern ohio Posts: 421	Whats a good seam sealer... Hey guys. I'm working on the cab of my 71 and was wondering if anyone can recommend a good seam sealer for the top and drip rails. I've read about the self leveling types. How exactly do these work? Are these sandable? Should i prime/paint(seal) before applying? The reason i ask is because i probly wont be painting the cab until spring...thanks in advance!

12-01-2011, 10:08 PM	#2
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,818	Re: Whats a good seam sealer... - I use a 3M product called "Fast 'N' Firm". You should be able to get it at any automotive paint supply house. 3M™ Fast N Firm™ Seam Sealer, Part# 08505. LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

12-01-2011, 10:16 PM	#3
mblackburnjr collector of vintage rust Join Date: Apr 2004 Location: southern ohio Posts: 421	Re: Whats a good seam sealer... thanks Lockdoc...any tips on applying it?

12-01-2011, 11:18 PM	#5
black_sheep454 Registered User Join Date: May 2011 Location: Lebanon, Mo. Posts: 1,315	Re: Whats a good seam sealer... 3M fast and firm down the back sides and 3m self leveling on the flat parts, or do the top then roll the cab and do the back sides. The self leveling is awesome. Posted via Mobile Device __________________ 1968 chevy lwb, getting ready to join forces with the 70 gmc 1970 gmc swb, getting ready to be a 68 chevy swb 1971 gmc lwb 2500 2wd Sierra Grande 1988 chevy 1-ton crew cab 2wd waiting for a 12v cummins

12-02-2011, 08:51 AM	#6
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Whats a good seam sealer... I use lacquer thinner on a rag to smooth it out. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

12-02-2011, 10:00 AM	#7
El Campo Registered User Join Date: Jul 2011 Location: El Campo, Tx Posts: 1,246	Re: Whats a good seam sealer... Like he was asking do you do this AFTER priming/sealing or do you do on bare metal? Posted via Mobile Device __________________ 72 Chevy blue LWB, 99% original Oklahoma truck, 28,000 miles 72 Chevy SWB: http://67-72chevytrucks.com/vboard/s...d.php?t=486626 (Attempt/Mistake #2) 2003 Harley Davidson Dyna Superglide with 2007 Street Bob front end 2000 Ford F350 Powerstroke 4WD CCLB, 310,000 miles running great (STOLEN St. Patricks Day 2014 AND NEVER RECOVERED) 2002 Ford F250 Powerstroke 4WD CCLB (To replace stolen one) Hook em Horns!!!

12-02-2011, 11:16 AM	#8
Bert W Registered User Join Date: Dec 2008 Location: Jackson, MS Posts: 373	Re: Whats a good seam sealer... watching this one, on my to do list. __________________ 1968 Chevy C/10 LWB V8 1983 K5 Blazer 1989 C1500 Stepside Reg. Cab V8

12-02-2011, 11:21 AM	#9
black_sheep454 Registered User Join Date: May 2011 Location: Lebanon, Mo. Posts: 1,315	Re: Whats a good seam sealer... I like to do it after atleast a zinc rich or etch primer. If you do it over lawyer or urethane primer make sure it sanded good. And with self leveling seam sealer you don't have to smooth it out, it dies it itself. Posted via Mobile Device __________________ 1968 chevy lwb, getting ready to join forces with the 70 gmc 1970 gmc swb, getting ready to be a 68 chevy swb 1971 gmc lwb 2500 2wd Sierra Grande 1988 chevy 1-ton crew cab 2wd waiting for a 12v cummins

12-02-2011, 01:00 PM	#10
Rob H. Registered User Join Date: Nov 2008 Location: Petersville KY Posts: 673	Re: Whats a good seam sealer... This post is just in time, needing to do this on my 72! __________________ Rob 72 C/10 (under reconstruction)(destruction ? LOL) 48 Willys CJ2A 1952 Super "A" Farmall (Grandfather's)

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