DensiCrete Application Summary
ALWAYS TEST DensiCrete ON A SMALL AREA BEFORE APPLICATION! All concrete is different and the initial test will help determine the number of coats to apply. Over application will result in white coating that is difficult to remove.
Application of DensiCrete to seal and protect existing concrete normally requires 1 1/2 to 3 coats, all of which will be fully absorbed into the concrete matrix. High strength concrete will typically take less coats and low strength concrete may require more coats.
DensiCrete has a recommended spread rate of 150 sq. ft. per gallon (equal to an 11 mil coat). A 1 1/2 coat application is used in the following example using a spray procedure as described below.
The first full coat of DensiCrete is applied using a 40 psi garden type sprayer, although it can be brushed or rolled on. At 40 psi, the sprayer has a spray rate of 0.4 gallons per minute. This means one worker will cover about 60 sq. ft. per minute with the first application. The second coat is usually equivalent to a half coat. Setting the sprayer at a wider spray will work faster and cover about 100 sq. ft. per minute with the lighter second application. This procedure assures quick and accurate application of DensiCrete.
After the first full coat, DensiCrete will be fully absorbed if the concrete is dry to the touch in 5-8 minutes. (It may still look wet, but DensiCrete with have a slippery feel when rubbing finger and thumb together). Apply a second coat which should be dry in less than 20 minutes. If not dry in 20 minutes or less, a second coat is not needed. If a second coat is applied and is not dry in 20 minutes, use a broom or squeegee to remove excess DensiCrete . If the second coat dries in less than 15 minutes, a full second coat and even a third light coat may be needed to treat extremely weak or porous concrete.
For existing concrete, it is recommended that the surface be pressure washed to clean and wet the surface. Squeegee any standing water before applying DensiCrete . Note that DensiCrete can evacuate embedded salt and oils to the surface. The evacuated material can be swept away or will eventually be washed away by the rain.
Cure and Seal
For use as a one and done curing and sealing treatment, DensiCrete should be applied to new concrete only after it is able to be walked on without leaving marks on the surface. Apply to a small test area to determine the number of coats to apply. Because of the excess water still in the fresh concrete, DensiCrete may take a little longer to penetrate. If it does not penetrate after 20 minutes, use a squeegee to remove excess.
DensiCrete will not penetrate acrylic sealers, paint, oil or most other coatings and must be in contact with concrete to work. Clean and pressure wash all materials from the surface prior to applying DensiCrete on existing concrete. If DensiCrete beads up on the test spot, it will not penetrate into the concrete and should not be applied.
DensiCrete should NEVER be applied to a dehydrated concrete surface. The way to rehydrate concrete is to wet down the surface prior to application. After wetting the surface, allow the water to stand for at least 20 minutes and REMOVE ANY standing surface water with a broom or squeegee prior to application.
DensiCrete should NEVER be applied to a cementitious surface that is below 50°F or higher than 90°F. If the cementitious surface is ABOVE 90°F wet down the surface until such time that the temperature drops below 90° and the surface is free of standing water.
DensiCrete should not be applied if DensiCrete or the concrete surface temperature drops below 50 degrees F. The chemical reaction is extremely temperature sensitive and DensiCrete will not penetrate properly and instead will just sit on the surface like a topical coating. Once the temperature increases back to 50 degrees F, the chemical reaction will resume but may lack sufficient water to fully penetrate due to evaporation of the water in DensiCrete.
SPECIAL NOTE: DensiCrete should NOT be applied when the air temperature is expected to fall to 32°F or below for 36 continuous hours or nightly for more than 3 days in a row, after the application.
Do not apply DensiCrete if rain is expected within one hour of completion of all applications.
Paint or any other coatings will adher best after DensiCrete has had time to cure, usually 28 days.
Remove any mulch next to concrete surfaces. DensiCrete over spray can pull dye from mulch into the concrete surface. It will also pull tire blackening products out of the concrete and may leave marks on the concrete.
Do not spray in windy conditions. DensiCrete will scratch glass and painted surfaces. Do not rub, simply rinse any overspray with soapy water before it dries.
Most concrete sealers are surface treatments that must be reapplied every few years. DensiCrete deeply penetrates becoming part of the concrete matrix and will last for many years. Nevertheless, over a long period of time, all materials will degrade due to various environmental factors. Therefore, we recommend that after five to seven years, a small part of the treated area be tested by applying a single coat of DensiCrete. If it takes more than 15 minutes for DensiCrete to be absorbed and become dry to the touch in that test area, then your concrete is still protected and will not need to be rechecked for another 5 years. If absorbed in less than 15 minutes, then you will benefit from another application of DensiCrete. Reapplication can also be beneficial to help seal the sides of any cracks that develop due to service stresses.
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WICKTEK INC. 1998 through 2010
DensiCrete MUST be applied as per the manufacturer's parameters and procedures.