I am a plumber. I am doing a job at a customers house, she is having stone tiles laid on the kitchen floor but it has a bitumen coat. The tiler came this morning and was not happy tiling on to the bitumen, he has made a few calls and still does not have a solution. The customer called the supplier of the stone tiles and they are sending somebody to have a look. That won't happen until next week so thought I would ask here to see if anybody knows of a product or method to fix tiles to bitumen?