Fully vitrified Porcelain tiles

[tileman]

Hi all, is it necessary to seal fully vitrified porcelain tiles, prior to grouting, they have a natural stone looking face, I didn't think it was until I read a Lithofin product sheet on the subject.
john

[davy_G]

spot test a few with different liquids before laying them and see if they stain or are porous. I usually refer questions like that back to the client to ask their supplier. It passes the buck somewhat but at least you asked the question and took the necessary action.

[MICK the Tiler]

As a general rule of thumb I would allow for sealing all unglazed pocelain, but as Dave has said the manufacturer would be your first port of call.

[Pawelzik]

Originally Posted by MICK the Tiler

As a general rule of thumb I would allow for sealing all unglazed pocelain, but as Dave has said the manufacturer would be your first port of call.

with Mick. Here my tip: Spot tests can be made by using fluids that are common in households (waht makes sense) and make evil spots like:
Tomato ketchup, black coffee, red wine, non-pemanent marker pencils (permanent markers = big problem), ink, citric acid (for cooking), vinegar and - my favourite - blood from liver (yak) Martin