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Old 03-17-2009, 10:38 AM   #1
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granite sealer


I just read ccarlisle reply to a sealer question and now I have some questions. I didn't know there was so much to picking out a sealer! I am doing my kitchen counter in a 12x12" granite. It is smooth and shiny so I assume it is polished. I will have 1/16" spacing and be using epoxy grout. What should I seal the tiles with? From what I have read I don't need to seal the grout so I should just seal the tiles before grouting and that will be it right?

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Old 03-17-2009, 12:58 PM   #2
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Well, like I also said there is no one reply that fits all situations - and here we are with another one: "granite" or more precisely what you were told was granite. There are literally a few thousand stones that are called 'granite' - not by stone guys - but by sellers and buyers of stone.

But sometimes the audience doesn't care about what is and what isn't a granite all they want is a sealer; so here's an answer for you.

First test a spare tile to see, if after 5 minutes or so, whether a drop of oil and water is being absorbed. If it does absorb into a polished granite tile, then a good impregnator-sealer is called for. Preferably one that is resistant to acids because amny soils ina kitchen are acidic. Follow the instructions on the bottle to the letter including how much and how many coats to put on and importantly when to put the next coat on after the first.

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Old 03-17-2009, 10:12 PM   #3
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It is a tricky subject. Most granites do NOT require any sealer at all. If in doubt, you can seal it though. Just make sure you use a high quality product that says it may be applied to granite. Aside from the water and oil test, squeeze a lemon on it.

You should let us know, and also do a search for the type of granite you are using, from there you may find a more specific answer.

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Old 03-17-2009, 10:44 PM   #4
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Thanks Jaz and Carlisle, I will do the tests and some searching and see what I come up with. I will be using unsanded grout with 1/16" gaps that I will need to seal. Since I'm sealing the grout anyway would it hurt/be a bad idea to just seal the whole thing including the tiles? Either way can someone recommend a good sealer for the grout?

Also I've read that some tiles you need to seal before grouting. Is this only for un polished stone tiles or when do you need to seal the tiles before grouting?

Thanks for all your help, Scott
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Old 03-18-2009, 08:51 AM   #5
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Good point, Jaz...forgot about the lemon test. Scott, if you see some sort of reaction between the stone and the lemon juice, for example, a dull etch mark after you wiped it off and dried it, then take that tile and return it. Then buy some real 'granite'...

No, no problem, in sealing the whole thing (grout+tiles). Seal the grout twice as much as the tiles if you prefer.
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Old 03-18-2009, 11:17 AM   #6
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Quote:
Originally Posted by ccarlisle View Post
Good point, Jaz...forgot about the lemon test. Scott, if you see some sort of reaction between the stone and the lemon juice, for example, a dull etch mark after you wiped it off and dried it, then take that tile and return it. Then buy some real 'granite'...
Is this something a person needs to worry about when having a granite slab countertop installed?
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Old 03-18-2009, 07:35 PM   #7
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No, I was a being a bit facetious; most granite doesn't react to acids.. that's probably why they are used in kitchens so extensively when compared to marble - which is reactive. Having said that, some may...

If I bought a granite countertop and saw a reaction, eg an etchmark from lemon juice, I'd be marching right back to the person who sold it to me asking for an explanation. It's my sneaky way of saying that not all granites are 'granite' by the strict petrographic definition of a "granite".
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Old 03-18-2009, 08:34 PM   #8
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Gotcha.
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Old 03-20-2009, 07:19 AM   #9
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any decent granite's not sealable IF its been properly polished,,, imn-s-hfo, most granites avail today aren't worth spit - even ( especially ) the 1 my bride select'd

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Old 03-20-2009, 07:48 AM   #10
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Yeah, in general terms you're right...IMO your statement applies more to marble than to granite however, and I am still waiting to see a stained properly-polished marble tile. I have seen a stained polished granite tile however...

And you're also right on todays 'granite'. To many, marble is marble, slate is slate and anything else, if not one of those two, will eventually become granite, in the showroom, on the boat across the ocean or in the quarry. So much magic in one stone! amazing...

Having said that, that process wouldn't exist if people didn't buy it in the first place.
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Old 03-20-2009, 08:08 AM   #11
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marble's fine for a t-top - c-top ? not in my house,,, got some guys here making a living repolishing residential/commercial marble floors marble's largely calcium carbonate ( fish bones under weight of succeeding layers of fish bones ),,, as such, it reacts w/ nitrous oxide ( car exhausts ) & turns into big alka-seltzer tablets accounting for unreadable marble monuments.

we fabricated & sold granite c-tops 40 yrs ago BUT only top shelf mtls same as cemetery memorials,,, w/demand driving availability, much of the stuff on the mkt today's just not acceptably hard/uniform/strong.

slate's another issue - have you noticed the pretty JUNK apron stores're selling out of india ? ? ? admittedly its attractive but, structurally, its deficient on most applications - again, mn-s-h-fo
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Old 03-20-2009, 08:09 AM   #12
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Granite sealer will not make your stone bullet proof. It won't prevent scratching or etching. A sealer will, however, help prevent possible stains from being absorbed by the stone. This in turn helps to preserve the beauty of your stone and makes it much easier for you to maintain and preserve it.

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Old 03-20-2009, 08:26 AM   #13
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' water absorption ' & ' scratching ' are testable according to astm standards,,, IF granite's correctly polished, any sealer will not find its way into the stone UNLESS its vacuum suck'd prior to polishing OR infiltrates thru total immersion,,, economics comes into play so corners're cut to keep prices affordable,,, some of the stuff available's so ugly it shouldn't be used in a blind dog's kennel let alone inside human dwellings

i use 0000 steel wool when my wife's not looking
but i also have diamond polishing pads & appropriate water-feed tools for the same,,, admitt'dly, these aren't typically avail to the avg h/o-diy'er off his workbench

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