I have been using a metal worker bottle to "collect" cute stickers I pick up when I visit new places. It makes for a great conversation piece, and acts like a scrapbook while still being something functional.

When I run out of room for new stickers I was thinking of trying to apply some kind of sealant on the outside of the bottle. I still want to be able to use it for drinking water though.

Does anyone have a substance to recommend for keeping my stickers safe?