Uses: as a surface preparation for concrete.

Simply rinses away

Ensures excellent bonding of coatings and reduces alkalinity of new concrete

Removes laitance (a weak dusty layer) on new concrete and will provide a key for surface coatings on very smooth concrete.

Coverage approx. 20 m² per 5 litres.

Surface Preparation
Cemtetch is the ideal way to prepare concrete for painting. Cemtetch will remove surface laitance (an easily abraded weak surface layer). A simple test for laitance is to scrape the edge of a coin across the surface, if a fine powdery film is easily removed laitance will probably be the cause and the surface should be treated with Watco Cemtetch. Cemtetch will also neutralise excess alkalinity in new concrete (concrete must be at least 4 weeks old), and create a key on very smooth concrete. Where chemical hardeners have been used, Cemtetch will help to remove the possibility of chemical inter-reaction with the paint.

Application

1. Floors should be thoroughly cleaned, removing grease or oil with Watco Concroff Super Safe or similar and left to become reasonable dry.
2. Particularly porous surfaces should be dampened slightly first.
3. Apply Cemtetch to a maximum area of 20m² per 5 litres in conjunction with harsh scrubbing by stiff broom or machine and leave for 15 minutes until all frothing stops. It is very important to apply Watco Cemtetch evenly to the surface, a plastic watering can fitted with a rose is ideal.
4. Flush the area with generous amounts of water to remove all traces of Cemtetch and allow drying thoroughly before painting. Brush and vacuum the surface to remove loosened particles laitance.
5. After treatment with Watco Cemtetch the surface should be inspected to ensure that all deposits of laitance have been removed. Test the surface again by scraping it with the edge of a coin, If a fine powdery film can still be easily removed from the surface further etching with Watco Cemtetch will be necessary,