I've only had a couple of polished porcelain jobs and used the Fila grime remover and Fila Porcelain sealer both times - they seemed to work well and the results were pleasing for me and customers.
As for cutting, I used my Rubi TR-600-S with a 6mm wheel and had perfect cuts everytime. One job was 500 x 500 diagonal set, so cut bed was restrictive but I managed to get the setting out bob on so had no issues.
