Frequently Asked Questions

How much preparation is required before applying Renew by QCStains?

Surface preparation is minimal, but it is absolutely critical that surfaces are correctly prepared otherwise, Renew by QC products can be prevented from bonding. Typically, pressure washing is all that is required to open pores in the surface. If there is anything on the concrete that would prevent Renew by QC products from penetrating (sealers, paints, “cure and seal” agents, dirt, oil, grease, glue, gum, etc.) then that substance needs to be cleaned off or removed before applying the stains.

Pressure washing equipment should be of adequate size and power to sustain 3,000 psi at 4-gallons per minute. Use a 15- or 25-degree fan tip. Do not use a jet stream(0-degree) tip. Keep the wand straight up and down while cleaning. Maintain a consistent distance from the concrete with the nozzle tip while covering the entire area with smooth, even strokes. Overlap each row, slowing down over areas with oil, paint or other undesirable materials to ensure thorough cleaning. Never bear down on the concrete.

Pressure washing will be necessary to ensure that the concrete surface is porous enough to achieve sufficient penetration. This rule also applies to newly cured concrete. Hot pressure washing should be done when oil or grease is present or cold pressure washing with a cleaner is acceptable. For even deeper penetration “hot water” pressure washing is recommended in conditions where extreme pedestrian or vehicular traffic is present. This will help prolong the life of the stain.

In areas where pressure washing is not possible, QC Floor Cleaner* or QC Concrete Degreaser & Neutralizer*, used with a floor scrubbing machine, is acceptable. Always rinse the surface thoroughly while cleaning product is still wet. Dried residue on the surface will prevent bonding.

For extremely dense or burnished surfaces, you may chemically open the floor up using QC Con-Clean* or mechanically open the floor by using a floor machine with a 40 to 100 grit sanding disc.