Yeah that’s all welding and dirt dust. Needs a good vacuum and a wipe down of alcohol.Wire wheel all the paint and dark stuff out of the cracks if you can. Get a better bond in all of the recesses.

Not sure don’t remember. It’s from SeymourIs that primer a sealer?
Wouldn’t doubt it, some 320 took it down to the primer really quick on the dash when I tried to scuff it.Probably still better than factory lol