Dulux Avista Polyurethane Sealer is a moisture cured single pack clear gloss polyurethane which will provide a hard wearing non yellowing coating for internal concrete surfaces.
Cleaning materials
Dulux Avista solvent
Application Tools
Paint brush, Roller or Spray
Ensure lid remains on drum tightly. Allowing air/moisture into the drum will cause the product to set.
Needs moisture to cure hard.
Low humidity inhibits cure.
Cannot be applied over solvent based acrylic sealers.
Not tintable with any colour tints.
The surface should not have foot traffic for at least 48 hours or vehicle traffic for at least 5 days.
Previously coated surfaces
Surfaces previously coated with Dulux Avista Polyurethane Sealer will require abrading & solvent wiping before being overcoated. Abrade with 100-120 grit sandpaper & sanding pole, to create a physical key. Solvent wipe to remove any dust.
Surfaces that have an unknown coating, such as paints, curing agents or acrylic sealers must removed by stripping or grinding.
New Cured and Old Concrete (unsealed)
Ensure concrete is sufficiently cured (recommended minimum 14 days). Concrete is to be clean and free of grease, oil, stiff broom and general purpose cleaner recommended. Any oil stains should be treated & cleaned with an industrial degreaser. Pressure clean surface at minimum 2000 psi and allow to dry. Acid etch with hydrochloric acid. Dilute approximately 20 parts water to 1 part acid (depending on porosity) to remove any loosely bound cement and laitance.
Note: smooth concrete will require a higher acid content. Maximum strength - 10 parts water to 1 part acid. Apply diluted acid to surface using a large head watering can, applying in a criss cross motion (approximately 5-10m² sections). Acid will start to fizz on the surface once it starts to react with the laitance in the concrete. Pressure clean immediately to clean and remove all remnants of acid (do not allow acid to dry on surface). Pressure clean at minimum 2000 psi. Allow surface to dry before sealing (sealing over damp concrete will cause whitening or cause sealer to lift).
Application 1st Coat
For smooth concrete surfaces the first coat must be diluted to penetrate into the substrate and provide better wetting. Dilution can be up to 20% with Dulux Avista Solvent. Diluted sealer must be used immediately. Do not store or return to original sealer. Note: Dilution not required when using Polyurethane Sealer as a top coat over flakes or epoxies. If there are some doubts about application and appearance, test a small area first. Apply by either a suitable paint brush or roller or airless spray. For roller application, a good quality 10mm-22mm nap, solvent resistant synthetic roller should be used. Nap length will vary depending on the substrate. For smooth surfaces, use a 10mm roller. For use over flake flooring a longer nap is recommended. For airless spray application, 20% Dulux Avista Solvent should be added.
Application 2nd Coat
Second coat should be applied within 6 -18 hours dependent on conditions prevailing. If too much time is allowed for cure, adhesion can be difficult to obtain on subsequent coats. If too much time has elapsed then the first coat will have to be abraded and solvent wiped to provide extra key before additional coats are applied. When surface is thoroughly dry, a very light mist of water over the Avista Polyurethane will accelerate cure. Recommended pump action sprayer or small spray bottle.
Note: Replace lid immediately after pouring required amount into roller tray. Failing to tightly reseal the lid can cause the product to cure in the drum.
