The Weatherproof Polyester Laser (LP) material is a very durable and water resistant material so the toner should not smudge or smear when wet. It has a strong permanent adhesive and can be used with most outdoor applications, however the toner used in standard laser 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