This is my saniderm method,I have used it for several years now and several tattoos.
1)in the first 24 hours,I leave the artist applied saran on for about 4 hours,then wash it with warm water and anti-microbial soap scrubbing with the clean palm of my hand,pat dry with a clean paper towel,then add a very light coat of palmers cocoa butter,then cover with fresh saran.
I repeat this every 3 or 4 hours for that 24 hour period.waiting 24 hours is enough time IMO for all the fluids to come out.
2) wash one more time,pat dry with clean paper towel,apply saniderm being careful to not have any bubbles.Make sure there is about a 2" overlap around the tattoo.leave it on for 4 to 6 days.
BAM ! done !
here is a pic of that method on my last one a few weeks ago.
(of course my wife helped with this one)
I buy the 10.2" X 2 yd roll ($16.95 directly from Saniderm.com) and I like lots of overlap.