For best project results, the concrete should be in sound physical condition, free of extensive cracking, pitting and spalling. The surface must also be dry and clean and free of dust, dirt, efflorescence, oil, chemicals, pevious flaking coatings and other contaminants which may block effective long-term adhesion.

For best visual results and long-term performance, cracks, holes and significant surface pitting should be filled with a cement patch material and allowed to cure as directed before proceeding.

Expansion joints in the concrete slab serve an important purpose, guarding against cracking in the slab due to movement — and should NOT be filled. If covering the expansion joints is still preferred, joints should first be treated with Weather Shield Flex Rubber Membrane and Flex seam mesh to minimize the chance of any cracking in the finish later due to slab movement.

Very smooth or "power troweled concrete" lacks optimal surface profile for most effective bond. In such cases, etching the concrete will add light bonding texture to the concrete and help ensure good "grab" of the coating. If etching is desired for an interior floor, use Natura Safe Etch as a safe alternative to muriatic acid. It will effectively clean the floor and add light bonding profile. See the surface preparation section for instructions on etching. Lightly rinse away etching / cleaning residue with water if there is adequate drainage. If there is no drainage, light rinsing followed by a wet vac will pull etching residues and dirt up off the floor.

***An alternative for ensuring good adhesion to smooth floors is to roll a coat of Weather Shield Flex Rubber Membrane (onto the washed and thoroughly dry floor). Flex will grip effectively to the smooth concrete and act as an effective bond enhancer for any Beauti-Tone decorative stone coating applied over top.

Removing all dirt, debris, etching residue and other contaminants is important for lasting performance. If the floor area is spacious and there is adequate drainage, an electric pressure washer can be used. Otherwise, mop the floor with a strong TSP (trisodium phosphate) solution. Follow by "rinsing" the floor with clean water mopping. Repeat until rinse water is clear. Let the floor dry until the following day before any coatings are applied. If the floor is a basement with limited air flow, circulating air in the room with a fan is a good idea to ensure effective drying.

Protect adjoining walls and other objects prior to starting work.

Good surface preparation is easy if performed with attention to a few key details. For best results, follow written product instructions. For detailed preparation information, a visit to the surface preparation section is also recommended.


Exterior Concrete Preparation

FlexRock for Interior Concrete



FlexRock® (by roller) is a three-part application that you can apply as a seamless finish or with a "grout" line pattern to make the surface look like stone tile or flagstone. FlexRock takes a little bit more work — but the decorative effects can be quite spectacular and unique.

STEP ONE: Roll on a uniform coat of Beauti-Tone Textured Primer which will grab onto the surface and serve as an ideal bonding surface for the FlexRock finish. After the Textured Primer has dried for 1 - 2 hours (longer in cool or humid conditions) — FlexRock can be applied.

STEP TWO: Using a 15mm paint roller, apply a uniform coat of FlexRock Floor Coating (at a coverage rate of about 80 sq.ft. per gallon or about 1/16" - 1/8" wet thickness) over the dry primer. If you wish, lightly roll over the wet FlexRock texture with a dry foam roller to soften any peaks of the texture before it dries. Continue until the surface is covered. Allow it to dry for 2 - 4 hours, or until it will support your weight.

Decorative Highlight Coat: Use the HardRock/FlexRock Texture Roller to apply the corresponding highlight color over the dry base coat. This process is fast and easy. Use medium roller pressure, to leave a uniform "dappled" finish. Apply in a uniform "X" pattern. See the full method here. (Let everything cure for 24 hours.)

Sanding: (If stencil tape was used, peel it up before sanding.) Use a pole sander — or a floor buffer for larger areas — loaded with 60 grit sandpaper to soften texture as desired, then vacuum ALL sanding dust.

Sealer: Apply two coats of HardRock Clear Coat Sealer a few hours apart, to complete the finish with a protective sheen. Alternatively, for ultimate durability on high traffic floor surfaces or demanding use areas, Beauti-Tone Epoxy Clear Coat is an ideal answer providing attractive sheen and a tough, wear resistant floor that's easy to clean. **Apply sealer or clear epoxy only after FlexRock has dried and cured for 24 hours.

*** OPTIONAL GROUT LINE & MORTAR JOINT EFFECTS: If a tile or flagstone effect is desired, a uniform coat of Beauti-Tone Textured Primer must be applied first in your desired "grout line / mortar joint" color. When Primer is dry, lay down a pattern as desired onto the dry primer using Beauti-Tone Grout Line or Flagstone Stencil Tape. Brush some textured primer over the tape to lock it down before FlexRock application as detailed above. (Leave the ends of the stencil tape free so you can pull it up later.) After FlexRock has cured for 24 hours, PEEL UP THE STENCIL TAPE to reveal the pattern and sweep up any debris before application of sealer/clear coat.

Visit the FlexRock product page
for additional details and videos.


If you have any questions — before or during your project — be sure to contact us at or call 1-877-279-0694. We are here to help you achieve great results!