I've just sand blasted off some seam rust from my van. What do I do next???
Should I dig out the old seam filler and put new stuff in?? What should I
use for that??? What sand paper grain do I use to smooth the bare metal???
Do I have to prime the metal befor painting??

any help is greatly appreciated as I have never done this before and what to
do it properly.

thanks,
Chad 85GL