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-   -   Sealing stone backsplash question (https://www.johnbridge.com/vbulletin/showthread.php?t=116634)

Canehdian905 06-05-2015 08:15 PM

Sealing stone backsplash question
I am about to install a backsplash with 2x4 polished clear filled travertine with a polished marble inlay. I have picked up some dupont stonetech pro sealer. The plan is to seal the tile before grouting but I have read multiple opinions on sealing the tiles. The grout will be un-sanded. Do I have the right idea or am I missing something?

Ron 06-05-2015 08:37 PM

Hi Steve,

That's a good impregnator that won't alter the tone or finish of the tiles. You don't have to seal before installation. You don't really even have to seal it before grouting but that might depend on the tile and the grout you have. To be safe, let's apply it after you've set it and the thin-set mortar has dried.

Apply the sealer generously with a brush or lambswool pad or even a cotton cloth saturated with it. (Dispose of these things safely later ...it is solvent-based, yes?). Let it sit on the tile a few minutes (5-10) and wipe off the excess by buffing with dry terry towels. You should wipe off spills on the countertop as you go. After 12 hours or so, it is ready for grout. This first application will act well as a grout release agent. If you are using unsanded cement-based grout, you should repeat with the same method after a minimum of 3 days so that the grout has had time to cure a bit. This final coat will seal it all at once. Make sure to use dry towels to buff off the excess sealer properly. You want it in the polished stone, not leaving a film on top.

Sealing with an impregnator is very easy to do.

Canehdian905 06-05-2015 09:11 PM

Thanks Ron!

The one thing I did not consider is using thin-set. I bought some mastic (chembond 1640) and after some reading I have realized it is not recommended for natural stone. Should I be worried about this or is it possible that the sealer will defend any possible staining absorbed from the mastic.

Ron 06-06-2015 05:02 AM

I don't really know but I refuse to use it for anything. It is better to use thin-set tile mortar.

Davy 06-06-2015 10:08 AM

I'm not familiar with that brand so I can't say for sure. Some times the oils in the mastic will absorb thru the marble and stain the stone on the face. I've also seen it stain the grout but that was on a job where I got in a hurry and grouted the same day I set the stone.

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