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Technical Note #6 - Applying Acid Stains

Applying Acid Stains

Prepare concrete ready for application of clear coating. As per Technical note#4. The concrete needs to contain sufficient Calcium for the stain to react. If the concrete has been densified or wash with acid the acid stain may note take in which case we recommend using FORTIS CONCRETE STAIN.

As the acid stain reacts with the chemicals in the concrete it is not possible to obtain a uniform colour. The intensity and final colour is determined by the amount of acid stain used and the concrete and as such no two floors will be the same. The stain is best applied by pump spray bottle. A simple 5 or 8 lt Hills or Gardenia insecticide sprayer will suffice. Do not brush or roll the stain as the brush strokes will be visible as darker concetration of stain.

To test the concrete, apply some water. If the water sits before wetting the surface it may require a grind. If the water is absorb straight away the concrete will absorb the stain. Always test the concrete to determine the exact reaction and colour formed.

Application is generally best done at the rate of 5-15m2 per lt. Only apply sufficient to cause wetting of the surface. If blending of colours is to be achieved spray sufficient to allow one liquid to flow into the other to soften edges of the colour (known as clouds). Further stain can be added once the concrete has dried.

Cleaning is required after the addition of the stain as concrete salts come to the surface. NO neutralization is required if using FORTIS CONCRETE STAIN. Mop the surface with cold water only to take off the eccess salt. Allow to dry fully before application of the clear coat. Note: The colour may look quite light and dull and it is not until the coating is applied that it is enhanced.

Coating the acid stain is the same as coating a concrete floor. FORTIS COAT 519 or FORTIS COAT 526 clear coats are recommended with the solvent based system providing a more intense colour.