Yes, you can apply Flexcolor CQ grout over existing Flexcolor CQ grout on deeper grout joints. The key is to leave only a thin layer on the joint surface.
For details, see our “Grout Troubleshooting Guide.”
It is recommended to wait 3 days before using the shower. In some cases, where conditions are very humid and cold, or if ventilation is insufficient, it may take longer to dry.
The thin-set mortars recommended for waterproofing membranes are polymer-modified thin-set mortars. Do not use mastics such as Type 1 or Ultramastic ECO on waterproofing membranes.
No, this grout requires no sealer and cures naturally from evaporation of the low level of water in the formulation; in any event, sealants do not adhere well to Flexcolor CQ grout, due to its formulation.
Yes, if the existing substrate is in good condition, clean the surface with a degreaser such as our UltraCare Heavy-Duty Stone, Tile & Grout Cleaner, rinse and allow to dry.
Then, prime the surface with ECO Prim Grip before applying the mortar.
It is recommended to prime the surface of gypsum-based substrates with Primer T diluted at 2:1 (two parts water, one part primer) or ECO Prim Grip primer.
MAPEI recommends a polymer-modified thin-set mortar such as Keraflex RS under and over the membrane.
Be sure to carefully follow the water ratios and all other instructions listed on the products’ Technical Data Sheets.
No; instead, use an appropriate MAPEI polymer-modified thin-set mortar that meets the requirements of ANSI A118.4 or ANSI A118.11, or an epoxy mortar that meets the requirements of ANSI A118.3.
MAPEI recommends using UltraCare Penetrating SB Stone, Tile & Grout Sealer on all cement-based grouts, porous natural stone, clay tile, cement-based tile, quarry tile, brick and polished porcelain tile. This sealer leaves the surface unchanged in appearance, is breathable, and doesn’t peel, flake or darken the tile or grout. Once fully cured, it helps protect against the absorption of both water and oil-based contaminants, making the surface easier to clean and maintain.
Both are roller-applied waterproofing membranes that meet the same standards (ANSI 118.10). The difference is in application, drying and coverage.
Consult the products’ Technical Data Sheets for more information on their specific attributes.
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