What would be the best way to change the color of a Frisbee golf disc?

ok so me and my friends just bought a couple frolf discs and some are in bad shape. we want to fix them up a little. i know i could try acetone (the stuff thats in fingernail polish remover) but im not sure it will work entirely. we want to buy some neon spray paint and just refinish them but ive heard that i can mess with the disc. we arent competitive players so i could care less if its illegal. i want to know if i spraypaint...will it make my disc worse?