brushed primer problem

[55 50 Ron]

I did a no-no. Painted some primer with a brush on sheet metal. The brush tracks show up and excess primer came out as uneven ridges.

I suppose I can sand it for a smooth finish. Will that be a correct thing to do? If so, should it be wet or dry sanding and what grit of sandpaper?

I've learned a lesson - next time spray the primer!!

Thanks - Ron
 

[Patsdeere]

Depends on the primer. If it is epoxy, it will be very difficult to sand. If it is more a general purpose primer then it can be sanded. I would hit it dry to get it close and then wet to finish it out. Chalk one up to a lesson learned. Just be glad it isn't a whole tractor.
 

[Stephen Newell]

I think I would sand it with a random orbital sander with 220 grit paper and sand the majority of the primer off and spray the primer on next time. If there is any ridges left the next coat of primer should fill the valleys.
 

[showcrop]

If I didn't have an orbital sander I would just take my cup wire wheel in my grinder. Clean up quick and start over sooner.
 

[GordoSD]

No, no. Never wire wheel tin prior to primer. Sand it. 220 is good. Wet or dry
 

[Stephen Newell]

Please explain further. I normally sand but I have painted over wirebrushed tin before.
 

[CNKS]

A wire brush will scratch sheet metal, sort of, but I use a fiber wheel on a drill that really leaves deep scratches, then I sand and fill them with urethane surfacer over epoxy, no problem.