One of the paper options, at most print shops, is waterproof paper. I use it, it looks normal and it works. No buckling or staining from moisture. It only costs maybe 35 cents extra per sheet. Commonly used by real estate agents. Not gloss photo or any of the other home use ones but specifically "WATERPROOF PAPER". Some will substitute brands with other descriptions but needs to confirm waterproof not water resistant. It is available for laser and inkjet but since laser is best for sun exposure, black and white laser on waterproof and you are golden.