Acid Etch for Floors is a solution that prepares floors for painting fresh concrete that is less than six months old. Surface alkalinity needs to be neutralised by etching. This is down to the fact that high alkalinity is not ideal for single pack alkyd based paints. This is when cement floor etching is required.
Its main purpose is to remove surface laitance, (which is a fine layer that forms after the floor cures). This creates a porous substrate better known as a “key” for the paint to fully adhere to the floor that does not easily peel away from the surface.
Please note that if the floor etching does not start to foam at the concrete’s surface, the surface may be sealed or polished and will require light ablation in order to produce a porous surface
Acid Etch for Floors contains a diluted hydrochloric acid base that reduces the alkaline content of new concrete floors (the floor must be at least four weeks old) or create a key on very smooth floors. This allows the topcoat to adhere to the surface.
- Apply with a watering can in a ribbon motion.
- Scrub with a stiff bristle broom, especially heavily stain areas.
- Wash off with a high powered hose.
- Sweep excess water and allow to completely dry.
- This creates a profile for the coating to adhere to, and prevents peel up.
Surfaces should be free from dust, dirt, grease, oil and other contaminants.
Pre-wet concrete surface with clean water ensuring that surface is uniformly wet without any puddles or standing water.
Apply acid etching fluid uniformly over the surface using a sprinkling can or acid tolerant pump unit. During the application process, scrub the acid solution into the concrete using a stiff bristle brush.
Allow the acid solution to remain on the concrete as long as the bubbling continues (normally between 2-10 mins). When the bubbling slows noticeably, flush the surface with plenty of water to remove all traces of the acid solution.
Check surface profile. Etching should produce a concrete surface which is clean and has a slightly roughened profile. If desired surface roughening is not achieved, repeat etching procedure.
Check the pH level of the rinse water on the wet surface with pH paper. Ideal pH level is 7.0 (neutral), but a pH range of 6.0 – 9.0 is acceptable for most coatings. If the pH is below 6.0, residual acid still remains and the surface must be rinsed again and rinse water rechecked.
Allow the concrete to dry thoroughly and prior to painting brush and vacuum the surface to remove any traces of laitance or other residue. For further information contact our Technical Service Department.
Please Note: Always carry out a test patch (approximately 100x100mm) before full application to ensure compatibility with previous coatings and the substrate, and to ensure the colour achieved meets your requirements. Failure to do so will result in a product refund claim not being accepted.