Concrete Floor Preparation

CONCRETE FLOORS:  ESSENTIAL PREPARATION OF CONCRETE FLOORS PRIOR TO ALLPICATION OF FLOOR COATINGS

Our Floor Coatings are supplied on the basis and assumption that correct surface preparation will be undertaken prior to coatings being applied.

If the correct preparation is not undertaken loss of adhesion can, and most likely will occur, resulting in the coating lifting or peeling.

Strict attention should therefore be paid to the following preparation requirements: -

NEW CONCRETEUnpainted and free from all contaminants

  • Concrete must be at least 28 days old.
  • Moisture content should not exceed 4% by weight.
  • Surface laitance ( a water rich top layer ) MUST be removed by sweepblasting or similar.
  • Remove all surface dust / dirt by vacuum.

OLD CONCRETE / PAINTED SURFACES

  • Remove all existing coatings which may not be compatible with our product.
  • Thoroughly remove all traces of Fat, Oil, Grease, Chemicals etc.  - this process should be completed PRIOR to any sweepblasting or acid etching.
  • If floor is contaminated by chemicals it must be neutralised before applying coating.
    • If acidic it must be treated with alkaline cleaner and rinsed thoroughly with fresh water.
    • If contamination is alkaline it can be cleaned thoroughly with detergent and / or steam.

ACID ETCHING

  • Before commencing acid etching the concrete surface should be cleaned of all loose concrete.
  • Deposits of oil and grease should be removed by steam cleaning or by using an alkaline cleaner.
  • Thoroughly wet the floor with water
  • Sprinkle SWS Co-etch uniformly over the floor,  the approximate spreading rate is 2 square meters per litre.
  • The Co-etch should remain on the surface for 10 minutes and then be rinsed thoroughly with clean water.
  • The rinsing can be done with a water hose and a sweeping broom.
  • It is important that the rinsing is done immediately to prevent the formation of salts on the surface, which are difficult to remove.
  • The concrete surface should be checked for acidity using pH paper and should have a pH of 7 or higher.
  • Depending on the type of concrete, more than one operation may be required to achieve a satisfactory surface profile.
  • A thorough rinsing with clean water should be carried out after each acid etch application.
  • The surface profile after acid etching should be similar to fine sand-paper.
  • The concrete should be allowed to dry prior to applying the coating.

 

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