Also, my test shower was tiled over the Schluter Kerdi® membrane, which is impervious, so no moisture was absorbed by the substrate.The grout will work better over more porous backings, and Prism will certainly perform better in summer in every part of the country.įinally, although Prism grout will tax your patience while installing it, washing is not difficult, and the end result is worth the effort. Had I run the air, I think the grout would have dried more readily. High humidity and the fact that it wasn’t warm enough to run the air conditioner worked against me. Next time I’ll try to wait for a day with less humidity. There is no way to easily get the grout into the joints and get it smooth the first time over, but I think the result is worth the effort. I still had a pasty consistency, but next time I’ll keep it a little stiffer.Ģ. I tried to keep it as stiff as possible, but I had such difficulty getting it to cling to the ceiling and walls that I loosened it up a bit. I think I might have had the grout mixed a little loose. I don’t think I’ve ever seen a better grout job.ġ. You can best see the color uniformity in the floor. As I said earlier, it was a humid day, but humidity would not have caused the phenomenon in standard grout. I was sure this would cause discoloration, but there wasn’t much I could do except to let the grout dry. When washing Prism, water seems to stay on the surface of the joints, and even after rinsing with the sponge tightly wrung I noticed small beads of water in many of the joints. I would not want to let it go any longer than that. I didn’t time it, but I think about 30 minutes elapsed between beginning to smear the grout and the start of the wash cycle. At this point the grout in the joints was still a bit loose, even though the surface area was completely dry. I went over the surface once and got the bulk of the material off while making sure all the joints were full. Don’t slop any excess water onto the surface. You’ll be happy to know that Prism grout is not hard to wash. With a feeling that approached utter joy I finally finished the ceiling and upper walls and began washing. By grouting one joint at a time and then going back over it with the end of the float I was able to get most of the grout to hang in the joints. I switched to a fairly hard epoxy float, and that seemed to help considerably. After several joints I would try to get as much of the excess off as possible with the edge of the float. I finally resorted to grouting one joint at a time. It is, of course, easier to slap the grout on the wall and then push it up onto the ceiling. Let it slake 10 minutes and then re-stir. Before you know it, you’ve got a smooth even paste.
Put a little water in the bucket, dump in some grout and give it a stir with a margin trowel. Prism doesn’t clump up as does standard sanded grout. The first thing you’ll notice about the new Prism grout (aside from its light weight) is its ease of mixing. Although I thought highly of the product, others apparently had problems with it, and it was ultimately withdrawn from the market. I’m not a newcomer to Prism grout, having used the original Prism on a Houston patio in 2005. The shower included walls, floor and ceiling - dense porcelain tile throughout. Weather conditions were mild, but humidity was a bit above the seasonal norm. I tested Prism “Haystack,” one of Custom’s most popular colors, on a Kerdi shower in a new home being built in the Texas Hill Country west of Houston. Several members of the John Bridge Ceramic Tile Forums were selected to field test the new grout. What would normally be a 25-pound sack weighs only 17 pounds, however, Prism will provide the same coverage as the standard grout. Prism grout is much lighter than standard sanded grout. Prism’s dense joints provide more resistance to stains than standard cement grouts.
“Prism offers consistent color with no shading regardless of tile type, temperature or humidity. After a false start in 2005, Custom Building Products, of Seal Beach, California, has re-released Prism SureColor Grout.According to Custom:
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