They deffo recommend 2 part addyTopps Quartz is gulf stone....
I've fixed gulf stone with ptb and no issues. I am aware topps recommend it but I'm also aware that most topps staff can't spell their own names. That said, gulf stone is the best and the only one I'd use ptb on. If you go that route, speak to Dave Wilson at bal technical and also get topps store manager to put it in writing.