The Weatherproof Matte Inkjet (WJ) and Weatherproof Gloss Inkjet (WI) materials are very durable and water-resistant materials so the print should not smudge or smear when wet. These can be used with most outdoor applications like bumper stickers, however, the ink used in most inkjet printers is not UV resistant so exposure to direct sunlight for an extended period of time could cause fading. You could potentially treat the labels after printing with a UV protective spray like Krylon's UV-Resistant Clear Coating to improve durability in direct sunlight. You are welcome to visit the link below to request free samples for testing with your application. https://www.onlinelabels.com/samples