Another painting question, primer after block sanding |
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Another painting question, primer after block sanding |
bbrock |
Oct 5 2019, 01:32 PM
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#1
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
Okay, I'm about halfway through my first cut of block sanding the PPG K36 surfacer on my car. So far I'm very pleased. I have a few (not too many so far) high spot where I sanded through to bare metal. My plan is to seal the whole car with a coat of reduced PPG DPLF epoxy primer before spraying color. My assumption is that this will also suffice to re-prime those few shiny spots of bare metal, but my combination of paranoia, and lack of experience make me think it wise to make sure the brain trust agrees with this. Here's a couple examples of the spots I'm talking about - gray patches are DP50LF primer base coat but you can see two roughly dime-sized shiny spots.
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roblav1 |
Oct 5 2019, 03:32 PM
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#2
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Senior Member Group: Members Posts: 528 Joined: 18-September 12 From: KY Member No.: 14,943 Region Association: MidAtlantic Region |
All bare metal should have DP epoxy. I would not put that over the K36 and then color. The DP is not a sanding primer.
If I went through, I recoated with both DP then K36. A pain. It taught me NOT to sand through to bare metal! |
bbrock |
Oct 5 2019, 03:48 PM
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#3
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
All bare metal should have DP epoxy. I would not put that over the K36 and then color. The DP is not a sanding primer. If I went through, I recoated with both DP then K36. A pain. It taught me NOT to sand through to bare metal! This isn't quite making sense to me. The DPLF tech sheet says it can be used as a sealer if it is reduced with acetone. It also says it can be used as a primer with or without acetone reducer. That's why I thought it would be okay because the reduced DP is going to be the last coat before base coat regardless. I definately want a gray seal coat under my base coat to get the right color. Also, the K36 tech sheet lists DPLF as a suitable top coat so I don't see there would be any compatibility issues. I'm more concerned about whether a single coat of reduced DPLF will provide enough protection |
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