I have just laid (first time !) black porcelain gloss tiles externally and used grey grout, however the tiles are now all grey, and they only appear the colour I want (black) when it rains, they are wet or I try and use a film removal liquid from Wickes, but then when they dry up they go back to grey again.
I have scrubbed and used stuff from Wickes (film remover) but again when it dries they all dry grey, is there anything I can put on these tiles to make them remain gloss looking all the time ?
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