No water needed, so I stuck one on at my desk right before tip-off and it went on smooth with no mess. It stayed put through the whole game and the peel-and-stick backing made it easy to swap onto my kid's shirt too.
Bought these for my daughter's basketball watch party and the peel-and-stick application was genuinely a breeze — no water cup, no soggy paper towel mess on the table. They held up through the whole game, even with her fidgeting, and came off clean when she was done.