Quoted from Haymaker:Its still available and could be used. It really doesn't have many or maybe any advantages over todays playfield coatings. Everything you've said is wrong and debunked forever ago. The problems are not due to environmental restrictions for the chemicals. Today's clearcoats are better than ever. Diamond plate isn't the end all be all of playfield coatings. If it was, you'd see guys like HEP using it instead of their clearcoats.
How has it been debunked?