Hi. My delightful kitchen had lime green and fluorescent orange tiles, so I bought some Ronseal one coat paint (I had some sceptism about the one coat, I must admit!). I cleaned the tiles several times and was as sure as I could be that I had removed all grease. Followed the instructions and cleaned them again with a bleach based cleaner etc and started painting. First coat went on with poor coverage but I reasoned it was better to have several thin coats and there were no other obvious problems. After leaving it for 24hrs to dry I sanded them down, removed residue and started on the second coat, and that's where the problems began! On some tiles, but not all, the second coat began to crack and both coats to slide off when touched. It's not necessarily where there would be grease although is mainly around the hob. Why is this happening and what should I do to rectify it? Thank you