The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Paint & Bodywork

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 01-10-2021, 11:51 PM   #1
FRANK70
Punisher70
 
FRANK70's Avatar
 
Join Date: May 2009
Location: SAN ANTONIO
Posts: 28
Primer over seam sealer

I have a chevy P-10 stepvan and used SEM seam sealer to seal the seams on the roof. The instructions said apply directly to metal so I did. I used Lacquer Primer for the roof and it did not stick to the seam sealer. It cracked. I was going to try Urethane primer or epoxy primer next to see if that works.
Does anyone have experience with this?
__________________
1970 c-10 short bed
350/edelbrock 4 barrel carb/mild comp cam/comp headers
positrac/350 trans/20" Lenzo wheels
FRANK70 is offline   Reply With Quote
Old 01-11-2021, 12:26 AM   #2
MikeB
Senior Member
 
MikeB's Avatar
 
Join Date: Jul 2000
Location: North Texas
Posts: 3,376
Re: Primer over seam sealer

I used the 1-part SEM seam sealer just recently The instructions say that it must be primed or painted within 0-24 hours. After that it should be scuffed with a scotch brite pad.

Their tech support folks are very helpful, so you might want to contact them.

800-831-1122
tech@semproducts.com
__________________
Mike
1969 C10 LWB -- owned for 34 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- sold
1981 C10 Silverado LWB -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 23 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!
MikeB is offline   Reply With Quote
Old 01-11-2021, 09:39 AM   #3
mongocanfly
Post Whore

 
mongocanfly's Avatar
 
Join Date: May 2015
Location: Alabama
Posts: 14,557
Re: Primer over seam sealer

I didnt use sem, but I sprayed over mine with epoxy,,,had no issues
__________________
Mongo...aka Greg

RIP Dad
RIP Jesse

1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598
Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334
Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563
2023 Chevy Z71..daily driver
mongocanfly is offline   Reply With Quote
Old 01-11-2021, 11:42 AM   #4
FRANK70
Punisher70
 
FRANK70's Avatar
 
Join Date: May 2009
Location: SAN ANTONIO
Posts: 28
Re: Primer over seam sealer

Thanks, I was going to contact the company but just wanted to get other peoples experiences.
__________________
1970 c-10 short bed
350/edelbrock 4 barrel carb/mild comp cam/comp headers
positrac/350 trans/20" Lenzo wheels
FRANK70 is offline   Reply With Quote
Old 01-11-2021, 11:58 AM   #5
FRANK70
Punisher70
 
FRANK70's Avatar
 
Join Date: May 2009
Location: SAN ANTONIO
Posts: 28
Re: Primer over seam sealer

I got off the phone with the people at SEM and they told me i didn't have to prime within the 24hour window but i needed to scuff or sand the seam sealer before I prime it. it is just easier to scuff it within the 24 hour window. And they did recommend epoxy primer for my use but also said i could use urethane if i need to sand it smooth. I hope this helps anyone else that has similar issues.
__________________
1970 c-10 short bed
350/edelbrock 4 barrel carb/mild comp cam/comp headers
positrac/350 trans/20" Lenzo wheels
FRANK70 is offline   Reply With Quote
Old 01-11-2021, 12:51 PM   #6
MikeB
Senior Member
 
MikeB's Avatar
 
Join Date: Jul 2000
Location: North Texas
Posts: 3,376
Re: Primer over seam sealer

How long had it been since you applied the seam sealer?
__________________
Mike
1969 C10 LWB -- owned for 34 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- sold
1981 C10 Silverado LWB -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 23 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!
MikeB is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 01:25 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com