Use UltraCare Epoxy Grout Haze Remover. Although Flexcolor CQ grout is not an epoxy grout, this product works great with it, so long as it is not allowed to remain on the grout joint for more than 20 minutes, which could damage the grout.
Yes. You need to follow the American Concrete Institute (ACI) 306R-10 Guide to Cold Weather Concreting. This guide will show you how to comply with the required application temperature. You can also refer to MAPEI’s “Installing repair materials in cold weather” reference guide.
No. The surface must be thoroughly cleaned of any substance that could interfere with the bond of the installation material, including dirt, paint, tar, asphalt, wax, oil, grease, latex compounds, form-release agents, laitance, loose toppings, foreign substances and any other residues.
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.
No, the concrete must be prepared by mechanical means to receive a thin-set mortar. New concrete surfaces should be wood-floated or broom-finished. Mechanically prepare concrete substrates to a minimum International Concrete Repair Institute (ICRI) concrete surface profile (CSP) of #2 to #3 for setting mortars. Grinding with a diamond blade is sufficient in most installations.
Direct application of tile mortars over oriented strand board (OSB) panels is not recommended; first, an uncoupling membrane such as Mapeguard UM is needed as a substrate for proper adhesion of the mortar.
For more information, see the technical document “Surface Preparation Requirements.”