Why you should use a sealer

B

Bob Hollinshead

If I can post this video correctly it's a perfect example of why a sealer should be used. This car was painted in all HOK products, blue metallic base with violet candy and clear and the painter did not use a sealer, it's a mess... I should have scratched in up and ran it through a high pressure car wash. All them hours, all those dollars in material wasted. It's getting stripped to bare metal for SPI epoxy.
[video]http://www.flickr.com/photos/118658121@N02/12763535973/[/video]
 
Not that I'm doubting you, but how would a sealer have prevented this? What is the substrate that the paint is flaking off?
 
Bob,
In the video, it looks like there are no scratches in the primer? Not sure.
Reason I ask, is extreme solvent trap will re-flow the scratches and make it look slick when the paint peels off and House of color can do this more then most, because of the many coats it takes to get the different layers covered??
I have talked to people that have done 15-20 coats in one day and then cleared, a disaster waiting to happen with that many coats on the same day.
 
i have done everything 100% right and had the paint fall off before my eyes . i try real hard to forget the failures i have seen over 40 years. i have come to realize solvents and primer are not my friend .
 
Barry;34613 said:
Bob,
In the video, it looks like there are no scratches in the primer? Not sure.
Reason I ask, is extreme solvent trap will re-flow the scratches and make it look slick when the paint peels off and House of color can do this more then most, because of the many coats it takes to get the different layers covered??
I have talked to people that have done 15-20 coats in one day and then cleared, a disaster waiting to happen with that many coats on the same day.
Click to expand...

There is fine sanding scratches, it looks like the surfacer was sanded with 600 and they shot color directly over it. There's no coating stuck to the backside of the paint chips. I agree they probably piled on at least 3 coats of strato blue and probably 5 coats of candy before the clear went on and they may have trapped some solvent but there isn't any cloudiness to the clear or evidence of solvent popping. Even if it was rushed sealer would have made a big difference in adhesion I bet. I have found no way to break the bond provided by using SPI epoxy as a sealer no matter if it's rushed or not-it's just bullet proof!

- - - Updated - - -

Barry;34613 said:
Bob,
In the video, it looks like there are no scratches in the primer? Not sure.
Reason I ask, is extreme solvent trap will re-flow the scratches and make it look slick when the paint peels off and House of color can do this more then most, because of the many coats it takes to get the different layers covered??
I have talked to people that have done 15-20 coats in one day and then cleared, a disaster waiting to happen with that many coats on the same day.
Click to expand...

There is fine sanding scratches, it looks like the surfacer was sanded with 600 and they shot color directly over it. There's no coating stuck to the backside of the paint chips. I agree they probably piled on at least 3 coats of strato blue and probably 5 coats of candy before the clear went on and they may have trapped some solvent but there isn't any cloudiness to the clear or evidence of solvent popping. Even if it was rushed sealer would have made a big difference in adhesion I bet. I have found no way to break the bond provided by using SPI epoxy as a sealer no matter if it's rushed or not-it's just bullet proof!

- - - Updated - - -

Arrowhead;34610 said:
Not that I'm doubting you, but how would a sealer have prevented this? What is the substrate that the paint is flaking off?
Click to expand...
the substrate is sanded 2K primer surfacer

- - - Updated - - -

Arrowhead;34610 said:
Not that I'm doubting you, but how would a sealer have prevented this? What is the substrate that the paint is flaking off?
Click to expand...
the substrate is sanded 2K primer surfacer
 
I have never used a sealer before paint i always sand. I only used 2k high build until I found spi. I have never had a paint job do that. The only time I have seen that was when a production job was rushed and not sanded at all. Theirs a guy around here that's famous for $500 wash and spray that has that same problem. I tried the seal a spray on new parts but I just didn't trust it so I still scuff with at least a scotchbrite pad but I'm hard headed and i have never had a come back doing it that way.
 
Me too!
I have never used a sealer in the past 35 yrs of painting,
other than a thinned coat of epoxy once in a while for color coverage.

- - - Updated - - -
 
I can see why using a sealer is good I just don't trust it if I don't sand it. I really don't know how some people can make paint peel like that, that's something that I'm proud to say I can't achieve.
 
Could this possibly be a problem with the primer? Like too much hardner? I thought barry mentioned in a previous topic about a guy who added twice the amount of hardner to the primer and barry said no matter what nothing will stick to it?
 
I hate reading these kinds of threads, it just scares the crap out of me something like this will happen on my next project. I think I have a routine that works, but there's always that unknown that can rear it's ugly head and ruin the whole job. Thanks for sharing though, I seal with epoxy but wet sand anyway just for insurance.
 
Standox tech sheet says to use 800-1000 in repair area then use 1200-1500 or a gold pad with paste on the rest of the panel.
 
I think many people don't use a sealer on repairs...however it should be used every time on a total repaint
 
this is whats happening to my friends 2012 hyundai genesis. its just flaking off and the primer is smooth underneath. looks just like the video. but this is straight from the factory
 
You're friends car could have been damaged on the lot or during delivery and repaired? I was at a local body shop a few weeks ago that was repairing a 2014 Silverado for the local dealer that got damaged during delivery to the dealer.
 
You must log in or register to reply here.
Back
Top