Does the Micra come with pre drilled holes in the door sills for rust proofing? I noticed on mine all the doors have at least 1 black sticker looking thing covering a hole.

I did purchase the car used so not sure if it was rust proofed before. But it doesn't show any signs that is has been.

I am wondering if I can just peel back the stickers blocking the holes and spray rust proofing in there my self with a can of rust check.