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Old 06-21-2018, 05:50 PM   #1
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Sealing before grout, will it reduce adherence

I have installed Rainforest marble tile (lots of veins, polished) and am using Laticrete Epoxy grout.

I was planning on sealing the tile prior to grouting, to make clean up off tile easier afterwards, but am thinking: Will that reduce adhesion of grout to the cracks of the tile if the sealant gets into the spaces between the tile?
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Old 06-22-2018, 08:54 AM   #2
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Hi Rainer,

I don't know what "Rainforest" tile is (what type of stone). But most marble tiles are factory sealed, and real marble is waterproof except for the faults. If you do seal, just make sure you don't run over the edges of the tiles. Do it before you set them.
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Old 06-23-2018, 01:11 AM   #3
Tool Guy - Kg
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Hi, Rainer!

Seems like you’re referring to Rainforest Brown or Rainforest Green?

Yeah, sealing will help on cleanup of grout. But there’s two issues that immediately come to mind:

1) Usually, the grout of a tile job is the “weak link” when it comes the to maintenance of cleaning. Most man-made tiles are fairly non-porous, so they clean pretty easy. It’s always the porous cementitious grout that’s tougher to clean. So using epoxy grout (fairly non-porous) with non-porous man-made tiles that are physically tough (like porcelain) is a way to obtain an install that’s durable and easy to clean. But the same is not true when you’re using a material like delicate natural stone. While epoxy grout will never need sealing and is easier to get cleaned than porous cementitious grout....the elephant in the room is this: only 2% of the total surface is epoxy grout......98% of the rest of the material is natural stone that is quite susceptible to stains. Especially with the boatload of fissures in this material. So the question becomes: why use expensive epoxy where it provides very little to no benefit?

2) And epoxy grout and natural stones don’t always get along. The resin in the epoxy can stain the perimeter of the tiles at all the grout joints...permanently darkening them. The problem is referred to as “picture framing”. This problem is fairly common on light colored natural stones and epoxy grout. I can’t tell you if the Rainforest Brown or Rainforest Green tiles are subject to the staining. But if you proceed with epoxy, you should perform a test with a little mock up to ensure you don’t ruin the whole kit and kaboodle with unexpected staining.

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Old 06-26-2018, 07:10 AM   #4
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Tonto is pretty right on.

Do a test area. The sealer will help with the preseal measures and it helps the cleanup but it will not stop the grout from setting up in the cracks/fissures/divots that are in the marble. The grout can still get in those areas and adhere. We always take caution on using epoxy grout on marbles. The resin from the grout can cause issues on lighter color marbles. So you need to proceed with caution. Our recommendation would be to use PERMCAOLOR Select rather than SPECTRALOCK epoxy in this case.

Since the grout does not need to be sealed we'd recommend STONETECH Heavy Duty Sealer or STONETECH Bulletproof Sealer.

We recommend full cure at 72 hours prior to grouting. Test area is a must!

If you have any further questions on this, I'd recommend calling my friend Jennifer Aleman in our LATICRETE Tech Services Department. She's a guru on our STONETECH line of products. She can be reached at: 1.800.243.4788
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Old 07-01-2018, 10:40 AM   #5
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Thank You

Thank you all very much for the replies.
I opted NOT to seal first, didn't want to take a chance in grout (epoxy) not sticking.
The job came out very well - again TY
The tile, BTW, is Marble - Rainforest Green. My bad for lack of specificity.

I had already bought the Bulletproof sealer which I applied yesterday. All well here too - one must work fast to not get residual from the sealer.

Again, TY all!
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