When overlapping Saniderm, do not overlap more than 1 inch so it can breathe properly. If I had any foreign objects under my Saniderm I would remove and replace. I always keep mine on for 24 hours, then change to 2nd piece(s) and change again before 40 hours as a 3rd final clean set or (piece) and Leave on for 4 days. I personally don't use Saniderm brand as it irritates me so now I use H2Ocean D-Lize Pro or Recovery Derm shield. Call a local Tattoo shop to purchase some new sheets if you can. But if leaving these current ones on, like they said pay attention to what's it doing. I keep 48 Yard rolls on me at all times. I am just a collector.