Wanted to say thanks for the info, and also post my experience with "Smith And Nephew Flexifix" (same idea as Taga/Sani-derm):
I got my outline and small amount of color fill completed last Thursday (upper arm wrapping around to bicep/tricep areas), and my artist wrapped with plastic. I wanted to wait overnight, but the wrapping was starting to come loose enough that I went ahead and removed after ~4 hours post session, washed everything with Cetaphil, applied a very thin layer of Aquaphor to the tattoo'd area, and applied the Flexifix.
Since the Flexifix comes in a roll, I had to get creative with the placement in order to get enough coverage (I had plenty of overlapping pieces). I left probably a 1.5" barrier around all sides in hopes of eliminating any leakage. The Aquaphor I applied just to help insure against the Flexifix sticking too aggressively to the linework when I went to remove it later.
The next morning it was pretty clear that the outline had almost no seepage whatsoever underneath the bandage, but the few areas that received color definitely looked similar to other posts here. This might explain why some people are able to apply right away the first night and leave it for 4-5 days, and why some people have too much seeping and have to wait until the next day, or change the covering after 24 hours.
I left things until this morning (Monday), removed the bandage (which was tougher than I was expecting after this much time), washed up things with the Cetaphil again, and applied some unscented lotion. The lines still look great, the little bits of color are vibrant, and overall things look good.
The arm feels slightly tender, but I think the majority of healing is completed now. I'll keep babying this until my next color fill session next week, the 'derm method so far has worked great for me!