This is going to be a real low decor oscar tank, which is why I didn't paint it black.
After several rounds of stringing together combinations of swear-words I didn't know I could create.. Then taking a break to consume two miscellaneous beers from the fridge, I got it on there. I added a strip of tape across the top and some on the sides. It does look remarkably better than being taped alone, as if it's fused to the glass. Clear and vivid. This after 2 beers. I am a party animal.
IMO, the problem stemmed from being coiled up so long at the store. I should have coiled it the other way or let it relax for some time before attempting this. The sides kept lifting/coiling. Top/bottom were OK.
FWIW, the product I used was Clear View by Marina. It seems like unscented baby oil. The background was from Marina, and recommended the oil product as an adhesive. So did the LFS of course. $8 for the tiny bottle too.