How to prepare new and old concrete or patio stones for sealing

June 20, 2007

Q: Shell, I have a new concrete driveway and feel it is time to seal it and I have older concrete patio in back as well an area of patio stones and would like the proper procedure to seal and protect all the surfaces.

Thanks,
Bob

A: Lets start with the new concrete and patio stones;

Before sealing you must acid wash the surface to etch the cement to enhance penetration of the sealer.
Use a solvent based concrete sealer for the initial application; 2-3 years down the road, acrylic coatings may be used.


Old concrete;

If badly stained (blotchy), follow brightening procedure before sealing.
If concrete has never been sealed but comes clean after use of Shell Busey Home Cleaning Formula, proceed with the following:

* Acid wash the surface, using 2/3 water & 1/3 Muriatic Acid, be sure to add the acid to the water, NOT the other way around.

* Allow to sit until a foaming action occurs, scrub with a stiff bristle brush and then rinse and allow to dry.

* It is best to apply the sealers using a low-pressure garden sprayer, or puddle on the surface and spread with a 10mm roller.

Caution: Wear safety glasses, clothing & rubber gloves when working with Muriatic Acid.

DO NOT DO THIS PROJECT IN DIRECT SUNLIGHT