I actually have been working on an effect where I dip a card in water and it starts to bleed, and it ruined my plastic cards. They are waterproof, but only to a point. Also, where can I find paper playing cards? All I can find in my local shops are plastic coated.There's nothing inherently wrong with it, I actually will bring plastic cards to the beach/pool to mess with because they're waterproof. However, they handle very differently than paper cards and its a totally different feel. To start flourishing with plastic cards you sort of end up having to relearn it to a point - it's difficult to explain, you should just get a deck and see for yourself.