How do you treat small rust pits on sheet metal?

I stripped a section of surface rust and old paint off a trunk, there is still some small surface imperfections and rust pits. I stripped it with 80 grit which removed most of it. They are really small can't be felt with hand. What are the preferred methods to repair?

 

Spot blast them. Everything else outside of dipping is just a topical repair and doesn't remove the rust. I would only feel good if it was absolutely gone.

 

As JJ said, blast them. You cannot get down in the pit with a sanding disc. Once you've blasted it out to gray metal, put some 2k primer on them. From there, you can apply your body filler or whatever and proceed with your body work.

 

A small wire brush may help somewhat. The 2k primer works well as stated above, but I like to use etching primer first and then top coat it with epoxy primer and then the 2k system.

 

These things are awesome:


I use one for a grinder though. I've been using them to strip the roof on my panel truck, and it was pitted to hell. Everything is cleaning up fine so far. I can post a pic of what I've got so far if you're interested

 

if he's not, i am. i'll be in his boat, most likely, before too long.

 

Here are a couple of pictures.

Before:




After:





Zoomed out:

 

I also tried the vinegar experiment. Some results were good, others were bad. Here's one of the good ones:

Before:



After:

 

This man speaks the truth!

 

I am interested in what this is, the picture does not load.

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I had some fairly deep pits in some areas on a 39 I built. I'm very anti sandblasting on sheet metal so after sanding to bare we coated the pits with SEM's Rustmort. After it dried wiped it down per the instructions, sanded it again to remove the Rustmort from everything except the pits then followed with DP40 and polyester primer. Had to go back and fill deeper pits with some with glazing putty. 3 years later nothing at all is showing up in the paint.
I'm sure maybe not the proper way to do it but I had used Rustmort in the past on interior panels, jams and such in the past, have had good success with it. Does seem to do a good job of converting rust to stop it.