Another painting question, primer after block sanding Options

[bbrock]

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.

[doug_b_928]

Dumb question from a noob who has yet to do this (but will be if I ever get the rust repair done). At this stage where you reveal small high spots do you gently tap them down with a hammer or does the next coat of surfacer build up enough that re-sanding the entire panel levels it?

[bbrock]

Dumb question from a noob who has yet to do this (but will be if I ever get the rust repair done). At this stage where you reveal small high spots do you gently tap them down with a hammer or does the next coat of surfacer build up enough that re-sanding the entire panel levels it?

Those are level with the rest of the surface now so everything will be done with primer or primer surface from this point forward. Others might do it different but if I start tapping these spots down now, it will open a bigger can of worms.

Here is my plan now. I'm going to spot spray the bare metal spots just to make sure I have DP over all bare metal before spraying more K36 to bring up the few remaining low spots. The if I can complete sanding to a perfect surface without exposing any metal, I'll go with a DP sealer coat as originally planned. If not, I'll shoot a full DP primer coat and wet sand down to 600 before shooting base color. The only issue I have with the full primer coat option is the time needed for the additional sanding since I don't know how much more painting weather I am going to have this year.