Jed, you want to paint the frame or the bladderless toons?
sound like he wants to paint the toons. I would think the only thing you could do is stain them a darker color. Even plastic paints will crack just from inflation/deflation.the toons will be lightly folded when not in use so i want a paint that will stick and not chip or peel away. also i am not sure about the toon material, i don't want to put a paint on that will eat or degrade the material.