Question for those who have used seam sealer - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BLACK AND BLUE 67-72 · 10-28-2003, 06:46 PM

You guys that have used seam sealers, what type is the best as for as not cracking, shrinking, peeling, and ease to use? Also how good is the brush-on type? And how long has it been with no problems? I got a type from Autozone and it really SUCKS!!! It wasn't 2 days and it started cracking, peeling, and shrinking. It did not remain flexible like the tube said it was supposed to. So now I get to redo it again and I would like to use something that will last. Also did you guys use any type of rust preventitive under it?

JimKshortstep4x4 · 10-28-2003, 08:28 PM

We use 3M Fast and Firm but we put it on in layers, letting it set for a couple of days in between coats. This works ok but if you don't do it this way, the sealant will shrink. This means you cannot paint until all of the shrinking is done. We prime before using Fast and Firm but use the brushable on bare metal. 3M's brushable will shrink, also.

I am not sure what was originally used but it is good stuff!

JIm

Terry S · 10-28-2003, 08:46 PM

Hey guys, Not to step on anyones post, but where is the best place to buy the 3m products?

JimKshortstep4x4 · 10-28-2003, 08:53 PM

I get my 3M products from the local Autoparts store, but it is also available from the paint suppliers.

Jim

EighthD · 10-28-2003, 10:32 PM

I used 3m automix 8308 heavy bodied seam sealer on my 71 p/u. Idid mine about 4 years ago and havent had a problem. You do need a special gun to apply this sealer. Any paint store that sells 3m products should have it.

**BIG ORANGE** · 10-28-2003, 10:44 PM

EightD is on the money,thats what I use and i get it at a automotive paint suplier in the cylinder you use a chaulking gun with. What I do is apply it and wet my index finger and wipe smooth,simple as that!

EighthD · 10-28-2003, 10:55 PM

I forgot to tell you to use masking tape on both sides of where you are sealing. then use your finger to smouth the sealer. then remove the tape and smooththe sealer again. I think you will be very happy with it. good luck.

Hooter · 10-29-2003, 01:52 AM

I have used proform, seam sealer a few times, I am happy with it, didnt shrink much, easy to apply with a caulk gun, and it was sticky as heck

Tuck · 10-29-2003, 08:41 AM

smooth it out with laquer thinner, put a laytex glove on, you will wipe most of it off. after I smoothed it out I sprayed the thinner over the sealer and you would of swore I sanded it.

72MARIO · 10-29-2003, 10:28 AM

GM still sells the original stuff.It's the same product they are using in there production Cars and Trucks today. That is what I used really good stuff. Just ask the part's Dude.

JimKshortstep4x4 · 10-29-2003, 10:44 AM

The local Chevrolet dealership, (parts dude), told me that GM does not have sealer in a tube. They do have strip sealer, which is very expensive, ($70 for a small box). He told me their body shop uses 3M sealers.

Jim

72MARIO · 10-29-2003, 07:08 PM

I will find the part number tommorow.

JimKshortstep4x4 · 10-29-2003, 08:39 PM

Thanks!

Jim

BLACK AND BLUE 67-72 · 10-31-2003, 11:16 PM

Any other thoughts or suggestions?

red71cheyenne · 10-31-2003, 11:46 PM

Do you guys use the same stuff for like around the windshield where the panels come together? Does it eventually harden and seal around there? Thanks, Jeff.

**FRENCHBLUE72** · 11-01-2003, 10:23 AM

I have used the 3-m stuff in the past and it worked well no shrinkage or crack's as of yet...

Blue Beard · 11-01-2003, 10:28 AM

What temp is best to apply sealer.......?

**Canadian694x4** · 11-01-2003, 01:22 PM

Quote:

Originally posted by 72MARIO
I will find the part number tommorow.

I would like to get my hands on that part number too...my drip rails are starting to crack (I don't know what the PO used but it lasted 10 years give or take) so this is sumthin I'll need to do for next spring when I get the Truck out.

BLACK AND BLUE 67-72 · 11-01-2003, 09:01 PM

Great info keep it comin'!!!

JimKshortstep4x4 · 11-02-2003, 08:15 AM

We tried the tip on using lacquer it it works for us. It will take the primer off which may or may not be a problem.

Jim

10-28-2003, 06:46 PM	#1
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Question for those who have used seam sealer You guys that have used seam sealers, what type is the best as for as not cracking, shrinking, peeling, and ease to use? Also how good is the brush-on type? And how long has it been with no problems? I got a type from Autozone and it really SUCKS!!! It wasn't 2 days and it started cracking, peeling, and shrinking. It did not remain flexible like the tube said it was supposed to. So now I get to redo it again and I would like to use something that will last. Also did you guys use any type of rust preventitive under it? __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA

10-28-2003, 08:28 PM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	We use 3M Fast and Firm but we put it on in layers, letting it set for a couple of days in between coats. This works ok but if you don't do it this way, the sealant will shrink. This means you cannot paint until all of the shrinking is done. We prime before using Fast and Firm but use the brushable on bare metal. 3M's brushable will shrink, also. I am not sure what was originally used but it is good stuff! JIm Last edited by JimKshortstep4x4; 10-28-2003 at 08:30 PM.

10-28-2003, 08:46 PM	#3
Terry S Registered User Join Date: Nov 2002 Location: Haysville, KS Posts: 118	Hey guys, Not to step on anyones post, but where is the best place to buy the 3m products? __________________ I can do all things thru Christ, but he evidently doesn't want me to beat that Camaro light to light....

10-28-2003, 10:44 PM	#6
BIG ORANGE Senior Member Join Date: Oct 2001 Location: Lancaster S.C. Posts: 4,752	EightD is on the money,thats what I use and i get it at a automotive paint suplier in the cylinder you use a chaulking gun with. What I do is apply it and wet my index finger and wipe smooth,simple as that! __________________ Things happen for a reason!

10-29-2003, 01:52 AM	#8
Hooter My other Love Join Date: Aug 2001 Location: Castlegar B.C. Canada Posts: 4,085	I have used proform, seam sealer a few times, I am happy with it, didnt shrink much, easy to apply with a caulk gun, and it was sticky as heck __________________ Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life

10-28-2003, 08:53 PM	#4
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	I get my 3M products from the local Autoparts store, but it is also available from the paint suppliers. Jim

10-28-2003, 10:32 PM	#5
EighthD Registered User Join Date: Dec 1999 Location: Santee Ca Posts: 251	I used 3m automix 8308 heavy bodied seam sealer on my 71 p/u. Idid mine about 4 years ago and havent had a problem. You do need a special gun to apply this sealer. Any paint store that sells 3m products should have it.

10-28-2003, 10:55 PM	#7
EighthD Registered User Join Date: Dec 1999 Location: Santee Ca Posts: 251	I forgot to tell you to use masking tape on both sides of where you are sealing. then use your finger to smouth the sealer. then remove the tape and smooththe sealer again. I think you will be very happy with it. good luck.

10-29-2003, 08:41 AM	#9
Tuck Registered User Join Date: Aug 2001 Location: pell city,AL Posts: 263	smooth it out with laquer thinner, put a laytex glove on, you will wipe most of it off. after I smoothed it out I sprayed the thinner over the sealer and you would of swore I sanded it.

10-29-2003, 10:28 AM	#10
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,052	GM still sells the original stuff.It's the same product they are using in there production Cars and Trucks today. That is what I used really good stuff. Just ask the part's Dude. __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

10-29-2003, 10:44 AM	#11
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	The local Chevrolet dealership, (parts dude), told me that GM does not have sealer in a tube. They do have strip sealer, which is very expensive, ($70 for a small box). He told me their body shop uses 3M sealers. Jim

10-29-2003, 07:08 PM	#12
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,052	I will find the part number tommorow. __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

10-29-2003, 08:39 PM	#13
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Thanks! Jim

10-31-2003, 11:16 PM	#14
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Any other thoughts or suggestions? __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA

10-31-2003, 11:46 PM	#15
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Do you guys use the same stuff for like around the windshield where the panels come together? Does it eventually harden and seal around there? Thanks, Jeff. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty



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11-01-2003, 10:23 AM	#16
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,604	I have used the 3-m stuff in the past and it worked well no shrinkage or crack's as of yet... __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

11-01-2003, 10:28 AM	#17
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,834	What temp is best to apply sealer.......? __________________ 1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo

11-01-2003, 09:01 PM	#19
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Great info keep it comin'!!! __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA

11-02-2003, 08:15 AM	#20
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	We tried the tip on using lacquer it it works for us. It will take the primer off which may or may not be a problem. Jim

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