I need some advice on a small repair. Took out a etch on a marble floor that has been crystalized. the marfil tiles turned out great but the black nero looks like a shiney lizzard. Cracked and bumpy skin. rehoned from 100 to 1500 with my makita and then 5x, tried 3 times with different amounts of water and 5x still the same. burnt it quick with mb-12. Looks like pores are still open? I've done this stone before with no trouble.