Bare concrete surfaces

1. Ensure concrete is fully cured (14–30 days depending on conditions) and free of grease, oil or paint. Clean surface with a commercial grade, general purpose cleaner.
2. Acid etch using Dulux Avista Hydrochloric Acid (dilute approximately 20 parts water to 1 part acid). Pressure clean the surface before acid dries. Allow surface to dry.
3. Pour Dulux Avista Waterbased Bare Concrete Primer into a roller tray and apply 2 even coats onto the surface using a good quality roller. Allow 1 hour between coats.
4. Apply 2 coats of Dulux Avista Concrete Sealer Waterbased Tintable Base using a 20mm nap roller, allowing it to dry in between coats (after application of Dulux Avista Bare Concrete/Sealed Surface Primer.)

If the surface has been sealed on multiple occasions, a cross hatch test should be done to check whether the surface needs to be stripped before applying the sealer.

Previously sealed concrete surfaces

A cross hatch test is required if the surface has been sealed more than 2 years ago to ascertain whether existing sealer is suitable to be resealed over.

1. Use a sharp blade to create a light “crosshatch” incision through the sealer.
2. Place a piece of self-adhesive tape (suggest clear packing tape) over the incision.
3. Press firmly for maximum adhesion and remove sharply. Repeat with fresh tape several times. If sealer is present on the tape, it is advised the sealer be completely stripped from surface. Seek professional contractors should stripping be required. If there is no sign of sealer adhering to the tape or delaminating from the surface, this would indicate that the bond of the existing sealer is sufficient for resealing.

Important note: If existing sealer shows signs of whitening or blooming, regardless of cross hatch test results, sealer may need to be stripped completely from the surface. Whitening may reoccur if new coat of sealer is applied over this problem.

 

Surfaces previously sealed with acrylic resin coatings

1. Carry out xylene test to confirm acrylic resin coating. Check label for Dulux Avista Sealed Surface Primer or Technical Data Sheet (TDS) for instructions.
2. Clean surface with a general purpose cleaner and allow to dry.
3. Apply 1 coat of Dulux Avista Sealed Surface Primer using a 15mm nap roller. Allow to dry.

Application Method

Brush (50-60mm high quality brush) and roller (20mm nap, synthetic fiber). If spraying, ensure even film build and correct spread rate. Stir thoroughly before and during use.

1. Stir well before and during application with a broad, flat paddle using an up and down scooping action.
2. Use a brush to apply to any edges and hard-to-reach places.
3. Then, use a roller to apply 1ST coat of Dulux Avista Concrete Sealer Waterbased Tintable Base evenly across the surface. Work in small sections, slightly overlap the previous section to minimize raised edges, maintaining a wet edge.
4. Lay off. Once section is coated, gently go over the surface in the same direction with an unloaded roller using minimal pressure. This will give a smooth consistent finish. Using poor quality or worn rollers can affect the final finish achieved.
5. Allow to fully dry before applying the 2nd coat.
6. Add the Dulux Avista Slip Reducing Additive if required by pouring the additive slowly into the sealer, while mixing with a hand paddle. Apply only into final coat of sealer. To avoid settling stir through every 2 minutes.
7. Use 500g of Dulux Avista Slip Reducing Additive for the 15L sealer pail.
8. Apply 2nd coat by repeating steps 2-4.

Tip: for rough concrete with peaks and dips, you may find that the sealer is difficult to apply in the dips. On the 1st coat try using the edges of the roller or a paint brush to work the sealer into dips. Allow to fully dry.