CHARACTERISTICS OF SUBSTRATE

Tilt up and precast concrete is a major building method for medium and large structures. Most structures require painting with conventional or textured coatings for both long-term protection and aesthetics. Tilt up concrete should be cured for a minimum 6 weeks before painting. Almost all tilt up panels have bond breaker compounds used on them which requires complete removal prior to coating. Use an appropriate bond breaker remover according to label instructions allowing 48 hours drying prior to coating. Patch any defects with suitable filling compounds and remove any surplus surface protrusions.

SURFACE PREPARATION

1.Water Bead Test- If beading occurs when spaying water onto the tilt panel, there is bond breaker present. If there is no beading and the water soaks in to the tilt panel giving the concrete a darker appearance, it is advised to try the secondary test.

2. pH Indicator Test- Fill a small clean container or spray bottle with fresh water. Immerse the PH indicator strip in to the water to get a PH reading. The reading should be between 6.5-7.5. If the pH level is above this the water might be contaminated, so fresh water directly from tap needs to be located and used. Once you have ascertained that the pH level of the water is between 6.5-7.5, hold a new indicator strip directly on to the concrete. Trickle water so it runs down the strip making sure the strip is in contact with the concrete at all times. Leave the water soak in for 1 minute then align the strip with the coloured scale on the side of the packet to determine the pH level. If the pH level is still between 6.5-7.5 or similar there is still bond breaker present. If the pH level is 8 +, the bond breaker is no longer present.

Clean the surface with suitable bond breaker remover and using a stiff bristle broom. Rinse thoroughly with clean water and allow to dry for 48 hours. Surfaces should be clean, dry and free of all contamination.

ADDITIONAL INFORMATION

Drying times are approximate at 25° C and 50% relative humidity. Allow longer drying times under cool, moist or low air movement conditions. Spreading rates will vary from the quoted theoretical rates depending on application methods and surrounding conditions.
Do not paint if temperatures are below 10°C or likely to fall below 10°C during drying period
Refer to TECHNICAL DATA SHEETS for additional information.

DATE OF ISSUE: 26-Mar-2012

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The information provided in the Luxury Paints Online Specification System is intended as guide only and is correct at the time of printing. It is valid for a period of twelve (12) months from the date of issue. Each specification should be read in conjunction with all relevant Technical Data sheets and Safety Data sheets and it is the responsibility of the reader to check this information prior to recommending the specification system to ensure that it is suited for the intended purpose.

Luxury Paints recommends that the online system should be used as a master reference for all new specifications. Printed copies of specification sheets should be cross referenced with the online system prior to issuing to ensure validity. Luxury Paints does not take responsibility for printed hardcopy specifications that have expired.