What next after welding?

[SambaS]

This is to the underside of the sills and underneath the car. It's currently bare metal, I've ground the welds down to tidy them up.

I'm going to use Schultz, a rubberised paint. Do I prime then paint the areas first though?

[Classic Grad 98]

Acid etch primer followed by basecoat and underseal in whichever order they were applied originally!

[Classic Grad 98]

Acid etch primer followed by basecoat and underseal in whichever order they were applied originally!

[J4CKO]

Yep, two coats of Acid Etch Primer

[Eggman]

I've had good results applying it to bare metal.

As I'm known to take the odd shortcut, I had a look at the datasheet here to see how naughty it is to do that. To my surprise, 3M say it's fine!