M
Michael kiss
:welcome::welcome:
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Hi and welcome, 4mm seems wide for the porcelain tile.
3mm for me and a good flexi grout such as bal superflex
I seal porcelain after fixed and grouted ( if needed ) I usally test an off cut with an inky and see how easy it wipes off.
Never heard of sealing the backs of them, would use white addy on them anyway if shaddowing is your concern.
what grout width would you recommend for porcelain tiles mate? thanks