Does anyone have experience with coating a poolsurface with tar to make a blackbottom pool?

Ah ! YUCK! No matter how you did the job of surfacing the pool with that stuff, you would end up with it all over. It would get into and on your bathing suits, feet and who knows where. It would track to the pool deck and into the house. Have you ever walked the beach and returned with tar on the souls of your shoes or feet?

uggh. Brilliant. Moronic idea !

What would you do when the water got warm?