These are called encaustic tiles, cement bisk. Think of them like a light coloured paver. They need a super good impregnator. Even then they can still be hard to keep clean so a matte finish topical should be considered, only as a back up plan.

> On 19 May 2016, at 8:55 am, Tony Deluna <tndeluna@gmail.com> wrote:
>
> Hey does anybody know the best sealer to use on these concrete tiles?
> I got a call from a general contractor who put them in six months ago and now they're filthy dirty with dirt all in the pits of the concrete tile.
> I was thinking about a topical coating to seal the micro pits but I'm concerned about it getting dingy and time.
> Any thoughts?
>
>
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> Tony DeLuna
> 925-625-9625
> www.PatriotStoneRestoration.com