Ok. Mine are the same but not more than 1mm wide and also a couple of feet long but the thing is even if they are not deep, they are still white so i m not aure if its only the clear coat that was removed... And i m kind of scared to start sanding my door...
I was also scared to start, but I was ready to even go to a body shop, so worse case was they would have to fix up what I messed up.
But I started on a small part, and the sand paper is 3000 grit (you have to wet sand) its really fine, it takes only a really thin layer of the clear coat off.
After sanded - the are come dull looking, thats where the compound and buffing comes in