I am stripping my car down to bare metal for a full restore. I have most of the outer shell stripped and want to start identifying all the dings and divots and such that need to be dealt with. Will it be a problem down the road painting wise if I use a magic marker to mark the spots needing repair? Areas will undoubtedly get sanded more after repair work so surface ink will be removed during that process but not sure if there will be chemical penetration into the metal which would cause an issue.