Pitting sealer
Thread Starter
Pro
Joined: Oct 2006
Posts: 541
Likes: 2
From: Sparks Nevada
Pitting sealer
OK, sprayed sealer today, hood was primed and blocked, no pits. Sprayed sealer and could not see any blemishes right after spraying. Check on it two hours later and a small cluster of pits now in center of hood.
Primer cured overnight, I scuffed, solvent cleaned and tack clothed. Weather was in mid 60 degree, not humid. I have two in-line filters on hose, gun was clean and primer and sealer are both DuPont products listed on tech sheets to work together... Sealer does not require reducer or catalyst, ready to shoot out of the can. Any ideas how to avoid this in the future?
Weeks of bodywork and sanding to get everything straight and smooth and still pitting. I'm painting the whole car which is apart, don't want the body to do the same.
Any thoughts?
Primer cured overnight, I scuffed, solvent cleaned and tack clothed. Weather was in mid 60 degree, not humid. I have two in-line filters on hose, gun was clean and primer and sealer are both DuPont products listed on tech sheets to work together... Sealer does not require reducer or catalyst, ready to shoot out of the can. Any ideas how to avoid this in the future?
Weeks of bodywork and sanding to get everything straight and smooth and still pitting. I'm painting the whole car which is apart, don't want the body to do the same.
Any thoughts?
Le Mans Master
Joined: Apr 2001
Posts: 5,438
Likes: 1,255
From: Sarver Pa
2021 C1 of the Year Finalist - Modified
A couple ideas for you : I use two inline filters AND a small final filter right at the gun. you also should have a drop with a drain in the line going to your filters. Your clothes must be clean, your hands must be clean, you can't even sneeze on it when you are painting ! A drop of sweat will make a mess.
I got away from using pre cleaner because I had some trouble. The type of rags or wipes you use can also give problems.
Don't push too hard on the tack rags you use also. So many variables. The main thing to remember is that oil (and water) is your enemy !!
Good luck, Pops
I got away from using pre cleaner because I had some trouble. The type of rags or wipes you use can also give problems.
Don't push too hard on the tack rags you use also. So many variables. The main thing to remember is that oil (and water) is your enemy !!
Good luck, Pops
Melting Slicks
Joined: Jan 2006
Posts: 2,487
Likes: 57
From: Williamsburg Virginia
Pin Holes Uck!
ML1955, I had the same problem with Dupont urathane primer this past summer. Had to seal car with epoxy primer to get rid of pin holes. Dupont has great paint can't say much for their primers. Good luck!
Earl
Earl
Team Owner
Joined: Mar 2002
Posts: 44,683
Likes: 1,832
From: Huntsville AL
Thread Starter
Pro
Joined: Oct 2006
Posts: 541
Likes: 2
From: Sparks Nevada
I think I found the problem: Rookie Painter!
Did some research, in the area where I had the worst pin holes, I was guilty of laying on too much paint and also a second coat before paint had time to flash. This cause "solvent popping" which results in pits in the primer. The surface dries faster than underneath, the solvent "pops" causing a small bubble which can result in a pit. I know I did both of these on this specific area. The rest of the car looked pretty good.
Remedy: even coats, slow down and wait for proper flash time.
Lots of putty work and sanding because I rushed...
Mike
Did some research, in the area where I had the worst pin holes, I was guilty of laying on too much paint and also a second coat before paint had time to flash. This cause "solvent popping" which results in pits in the primer. The surface dries faster than underneath, the solvent "pops" causing a small bubble which can result in a pit. I know I did both of these on this specific area. The rest of the car looked pretty good.
Remedy: even coats, slow down and wait for proper flash time.
Lots of putty work and sanding because I rushed...
Mike
Le Mans Master
Joined: Mar 2005
Posts: 7,631
Likes: 11
From: Rocklin California
I think I found the problem: Rookie Painter!
Did some research, in the area where I had the worst pin holes, I was guilty of laying on too much paint and also a second coat before paint had time to flash. This cause "solvent popping" which results in pits in the primer. The surface dries faster than underneath, the solvent "pops" causing a small bubble which can result in a pit. I know I did both of these on this specific area. The rest of the car looked pretty good.
Remedy: even coats, slow down and wait for proper flash time.
Lots of putty work and sanding because I rushed...
Mike
Did some research, in the area where I had the worst pin holes, I was guilty of laying on too much paint and also a second coat before paint had time to flash. This cause "solvent popping" which results in pits in the primer. The surface dries faster than underneath, the solvent "pops" causing a small bubble which can result in a pit. I know I did both of these on this specific area. The rest of the car looked pretty good.
Remedy: even coats, slow down and wait for proper flash time.
Lots of putty work and sanding because I rushed...
Mike
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