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01-10-2021, 11:51 PM | #1 |
Punisher70
Join Date: May 2009
Location: SAN ANTONIO
Posts: 28
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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?
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1970 c-10 short bed 350/edelbrock 4 barrel carb/mild comp cam/comp headers positrac/350 trans/20" Lenzo wheels |
01-11-2021, 12:26 AM | #2 |
Senior Member
Join Date: Jul 2000
Location: North Texas
Posts: 3,531
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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 35 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 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
01-11-2021, 09:39 AM | #3 |
Post Whore
Join Date: May 2015
Location: Alabama
Posts: 14,657
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Re: Primer over seam sealer
I didnt use sem, but I sprayed over mine with epoxy,,,had no issues
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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 |
01-11-2021, 11:42 AM | #4 |
Punisher70
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 |
01-11-2021, 11:58 AM | #5 |
Punisher70
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 |
01-11-2021, 12:51 PM | #6 |
Senior Member
Join Date: Jul 2000
Location: North Texas
Posts: 3,531
|
Re: Primer over seam sealer
How long had it been since you applied the seam sealer?
__________________
Mike 1969 C10 LWB -- owned for 35 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 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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