You really could do either or neither. If your using an epoxy primer sanding is not necessary. If not you could wet or dry sand whichever you prefer. Wet sanding makes for a smoother texture finish and less dust of course.
For pure sanding of bondo or metal, No. If you are preping to paint or sanding primer you should use Wet or Dry sandpaper and sand wet.
Sand can be wet or dry.
Sand well first with 600 grit wet 'n dry. Then use a good primer coat before painting.
Dry sand is dry because it has little or no water in it. Wet sand is wet because it is saturated with water. Wet sand is often found on ocean beaches.
because wet sand is cold from the cold water that makes it wet, and dry sand is in the sun and the water cant reach all the sand.
No sand is not a element.
wet sand
I would sand it down with sand paper then paint with primer. After that apply a outdoor paint. Prep work should be smooth If you really want it to be nice hit the primer with a light sandpaper after the primer coat.
if it is wet take out the wet sand you can sift and reuse sand but 5 times max
# Sand it # Apply primer # Paint it # Apply varnish
Use a good primer, then you don't need to sand.