I have a Pilkington multiversa-tile red quarry tile floor. The tiles are very matt, with no shine. I tried using HG terra cotta shine seal, which has worked well on other quarry tiles in the house but it had no effect. I then thought that perhaps I needed to seal the tiles, so tried HG impregnating protector, and then the shine seal. Result? No difference. Still very dull. So what should I use, and do I now have to clean off the impregnator first?