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Custom Building Products

Model GTMW7-4

Internet #204847121

Store SKU #731367

Store SO SKU #1000240593

Glass Tile 7 lb. White Premium Thin-Set Mortar

$13.97 /each
  • Consistent bright white color
  • Unsurpassed bond strengths with minimal shrinkage
  • Superior non-sag and non-slip performance

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Product Overview

Glass Tile Premium Thin-Set Mortar offers the ultimate in bond strength for the most demanding installation requirements for larger format glass tile, glass tile mosaics and other difficult to bond tile and stone. Glass Tile Premium Thin-Set Mortar is formulated to provide a consistent bright white back drop for clear, iridescent and translucent glass tile to accentuate its brilliance and beauty. The non-sag properties support vertical installations so tile won't slip.

California residents: see   Proposition 65 information

  • Unique blend of fine aggregate and premium white cement
  • Contains excellent handling characteristics
  • Exceeds ANSI A118.4, A118.11 and A118.15 without the need for additives
  • Superior bonding to plywood and to glass and porcelain tile
  • Extended open and adjustment times
  • Note: Product may vary by store



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Customer Questions & Answers

29 Questions45 Answers

Customer Questions & Answers

Glass Tile 7 lb. White Premium Thin-Set Mortar
Glass Tile 7 lb. White Premium Thin-Set Mortar

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4 answers

How can I mix small amounts? ie: What is the ratio of cups of water to cups of morter ?

This question is from Glass Tile 7 lb. White Premium Thin-Set Mortar
Asked by
Southold, NY
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April 9, 2014
I need to mix up enough to set just 2.5 square feet of ti[e. How can I mix this small amount ?
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Asked by
Essex County, NJ
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Home Improvement Profile: DIYer
October 9, 2015
Answer: 
The ratio is one part water to five parts mortar mix, by volume. First put the water in the pail and add about 1/3 of the measured mortar, Mix that first as a thinner mix, then gradually blend in the remaining mortar. It will get somewhat thick, which is what you want. It will become a little difficult to mix, but a 2" knife will do it (do not need an electric drill and stirrer - it wastes so much Read More
The ratio is one part water to five parts mortar mix, by volume. First put the water in the pail and add about 1/3 of the measured mortar, Mix that first as a thinner mix, then gradually blend in the remaining mortar. It will get somewhat thick, which is what you want. It will become a little difficult to mix, but a 2" knife will do it (do not need an electric drill and stirrer - it wastes so much material). It just takes a strong hand and a deliberate mixing stroke, turning over the mix frequently. Read Less
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Asked by
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May 13, 2014
Answer: 
you can mix any amount you will need. use a small scale to weigh the water and the powder
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Asked by
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May 6, 2014
Answer: 
Since you only need a small amount mix small amounts apply and mix more if needed. Don't get caught up in doing the math to figure out how much to mix.
Start with a cup or two of mortar, mix with mater until you get a peanut butter like consistency (you don't have to be real precise.) apply the mortar and mix more if needed.
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Asked by
Technical Service Dept. Corp office
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April 10, 2014
Answer: 
The mix ratio is 3:1 Three cups of powder, one cup of water. If you need further assistance contact our installation division at 800.282.8786
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3 answers

Kitchen backsplash

This question is from Glass Tile 7 lb. White Premium Thin-Set Mortar
Asked by
freehold, nj
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May 11, 2016
I was told I should use this product for glass 12x12 sheet tile that I am using. its on a painted drywall...some say sand first and some say don't have to..or some say use mastic instead of this product...the tile isn't a clear tile..there is some light grey, taupe and off white. and for 25sq what ratio should I use
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May 12, 2016
Answer: 
DO NOT USE MASTIC ON GLASS TILE! If you use mastic on glass tile, your tile will come loose and fall off in a short time. Use this glass tile thin set. I have repaired glass tile where mastic was used for original install. I used this product and has stood up great.
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May 12, 2016
Answer: 
Always refer to the glass tile manufacturer's installation instructions. Glossy or painted surfaces must be sanded, or abraded, and stripped of all contaminants. For further assistance please contact our installation division at 800.272.8786 option 2
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May 11, 2016
Answer: 
DO NOT USE MASTIC ON GLASS TILE!
If you wise mastic on glass tile, your tile will come loose and fall off in a short time. Use this glass tile thin set. I have repaired glass tile where mastic was used for original install. I used this product and has stood up great.
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3 answers

To use this on below water pool tiles, do I have to add an additive?

This question is from Glass Tile 7 lb. White Premium Thin-Set Mortar
Asked by
Round Rock, TX
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April 26, 2016
I putting back up some pool tiles that sit just below the water line. I bought Home Depot's Mortar Admix to use instead of water in mixing the thinset, if needed. Do I need the Mortar Admix?
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April 27, 2016
Answer: 
Glass Tile Premium Thin-Set Mortar may be used in submerged applications without the need of any additives. For further assistance please contact our installation division at 800.272.8786 option 2
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Asked by
Essex County, NJ
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Home Improvement Profile: DIYer
April 27, 2016
Answer: 
I do not think you need anything but the original boxed Glass Tile Product. It has nothing to do with the fact that water is used to mix the mortar. Once the mortar sets, it becomes a cement. Once this chemical reaction happens, the cement is chemically stable and unaffected by water. This is the same reason why contractors can pour bridge pilings from concrete and they are most certainly submerged all Read More
I do not think you need anything but the original boxed Glass Tile Product. It has nothing to do with the fact that water is used to mix the mortar. Once the mortar sets, it becomes a cement. Once this chemical reaction happens, the cement is chemically stable and unaffected by water. This is the same reason why contractors can pour bridge pilings from concrete and they are most certainly submerged all the time. To be 100% certain, I suggest you call the helpline on the Glass Tile box. I have found the folks at Custom Building Products to be super helpful and they will tell you exactly what to do. Follow what they say to the letter. The last thing I would do is add another product, like the Admix, which modifies the chemistry of the Glass Tile product. In doing so, you might render the Glass Tile mortar to be less resistant to water. It all depends upon the chemistry of the mortar mix and Custom Building Products knows that better than anyone else. Good luck with this! Call the help line... Read Less
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Asked by
Anonymous
Chicago, IL
Home Improvement Profile: Professional
April 27, 2016
Answer: 
Sorry, I do not know enough about this product th give advise on below water usage.
Try a pool maintance company.
Rick
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3 answers

can you use this in a shower or wet area ?

This question is from Glass Tile 7 lb. White Premium Thin-Set Mortar
Asked by
Toronto Ontario
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September 3, 2015
installing mosaic in a shower, can you use this ? Or is it just for backsplash areas ?
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Answers (3)

Asked by
Essex County, NJ
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Home Improvement Profile: DIYer
October 9, 2015
Answer: 
Not sure about this. Suggest you call Custom Building Products tech hotline. They are very helpful and will answer your concerns, tell you exactly what to use and how to apply it.
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Asked by
Randolph, MA
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Home Improvement Profile: Professional
September 20, 2015
Answer: 
Yes, it is suitable for shower areas.
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September 8, 2015
Answer: 
Yes, Glass Tile Thin-Set Mortar is suitable for wet areas, floors and walls.
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Customer Reviews

Rated 4.6 out of 5 by 22 reviewers.
Rated 3.0 out of 5.0 by Disappointed. Stiff and hard to work with In spite of the other reviews, I don't find this as nearly as good as the material I used when I ran out of this stuff! I had 16 square feet of 6" hadn-made glass tiles to lay down for a wall hanging, and started with the Custom product from HD. I ran out (though the box siad I shoudl have had enough) and since the store didn't have any more I had to switch to a product carried at another big box store across the street. Wish I'd purchased that other product first. The Custom material from HD seemed much more gritty, stiffer, and not as easily applied to tiles, harder to spread. Followed the directions to the letter, but stiffer and harder to work with in general. This was surprising because the HD stuff actually used more water per pound than the second product I used (TEC brand). The TEC was much smooth., more compliant, adn seemed to adhere better to the tiles. My next project won't doen with the Custom brand material from HD. I'll stick with the TEC product. Cheaper too. July 17, 2016
Rated 5.0 out of 5.0 by Grout Don't follow instructions on this one 20 minutes is to long to wait to wipe off the tiles. It's best to do a 2 ft section then wipe the grout off. April 12, 2016
Rated 5.0 out of 5.0 by Glass Tile 7 LB. White Premium Thuin-Set Motar This is the first time I have had the opportunity to use this product. I read all the reviews and decided to give it a shot. Installed glass backsplash in my kitchen. This product was very easy to work with. I am not a professional installer. As result, I work a bit slower than a professional. I found this product didn't set up as fast as I have used other motor. It allowed me to work at my own pace without the mortar solidifying. This was very helpful and not wasteful. I strongly recommend this product. You will be very happy. February 10, 2016
Rated 5.0 out of 5.0 by Easy to use, did the job This mortar is for applications with transparent or translucent materials where the color behind the materials is important. It is easy to use and does the job. Be sure to read safe installation instructions. February 10, 2016
Rated 5.0 out of 5.0 by Works! I love this product. It really brought out the color of my glass tiles and made it more brilliant. I was hesitant if it would do what it promised but I took a chance from what I read of the reviews. Glad I did. No regrets. January 26, 2016
Rated 5.0 out of 5.0 by Good deal I had a small tile job, my first one at that. I needed a white quick set, but could only find it in 25 & 50 lb bags. This was the perfect size and was easy to apply. December 29, 2015
Rated 5.0 out of 5.0 by Easy to Use Money Well Sent We installed paper faced translucent glass tile that was costly and I didn't want to ruin the effect by using the wrong type of thin-set This thin-set was perfect! Easy to use and worth every penny!! December 15, 2015
Rated 5.0 out of 5.0 by Easy to mix, strong initial tack, no sag, no tile stains, no scratches. Perfect! Highly recommended. Called Custom Building Products hot line for tech support and their recommendation for thin-set for our 1" hexagonal travertine marble tile backsplash. They recommended this product and were spot on. They advised that with a porous stone tile, like marble, if you use the wrong thin-set, the chemicals from the mortar will leach into the tile and push the natural salts inside the tile to the surface, causing the yellowing and staining that folks commonly complain of when setting light colored natural stone tiles. They told me the proper water-to-thin set mix to use. This was helpful, because I mixed it in small batches on a 1/2-Gal pail. It needs to be mixed thick. I was able to mix it well with a 2" putty knife. Let it stand for 5 minutes and mixed again. It was perfect for the job. Good initial tack to grab and hold the tiles. No staining or scratching of the tiles, which is a common complaint with other mortars. Grouting was also easy with Custom Building Products non-sanded grout (purchase as powder in a box, many pre-blended color choices) - used a light color to prevent bleeding color into the marble tile. The edges of the tile were initially dark while the grout was drying, but when dry after 24 hours the darkness faded to nothing. The job turned out perfect! This product line is highly recommended, October 9, 2015
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