I used to use a red tape by Polyken, like the blue R-tape but doesn't take as much effort to get off, I remember being told and later confirming that the red Polyken doesn't stick so badly to aluminum as blue R-tape. Also used to use a box sealing rubber based adhesive tape from Uline which worked well too. About 2 yrs ago we went to permanent block out which to this day has been a really great product for us, now tapeless except for reg marks and emergencies.