4 tattoo's healed with -derm, first 3 being only line work. By the time I removed the derm (first sheet, minimal weeping) they were flat, never had any tightness, sensitivity or peeling. Basically didn't have to do anything for the healing.
The latest piece is larger and full colour so it was a little different. Replaced my saniderm in under 24 hours, kept the second piece on for 6 days. It's 2 days after an my tattoo is flat, vibrant and done flaking.
After washing I let air dry and apply a drop or two of squalene oil. If it's really dry and flaky I thickly apply lotion
(tattoo goo because I'm using it up and it's thin so it's easy to remove excess) and let that sit in for a minute before wiping away what wasn't absorbed. After that, if I run a clean hand down the tattoo, the extra dead skin rolls off without pain or pulling. What is still attached to living tissue breaks off so I am not risking pulling out ink. (Without saniderm, I don't try this until it's been a few weeks and it's going through a second peel.)
It's certainly not the recommendation, but it really works for me.