SURFACE PREP: NUROOF COOL

Jan 01, 2013

Surface Preparation Guide for Nuroof Cool

  • Surfaces must be clean, firm (sound) and thoroughly dry before painting.
  • Remove any fungal growth or algae with household bleach (3.5% solution of sodium hypochlorite) thinned 2 parts bleach to 1 part water by volume.
  • Leave on surface for approximately 1 hour, then scrub with a hard bristle brush to remove all dead growth.
  • Rinse thoroughly with fresh water and allow to dry.
  • Repair leaks and defective flashing with PLASCON ROOFSEAL MEMBRANE.

Plascon-Nuroof-Cool-Premium

1. Galvanised Iron:

1.1 New: Remove fabricators pre-treatment oil, grease and any other contaminants with METALCARE GALVANISED IRON CLEANER. Hose and scrub down with a hard bristle brush and fresh water and repeat cleaning process until a water break-free surface is obtained. Prime with METALCARE GALVANISED IRON PRIMER.

1.2 Unpainted and weathered: Remove oil, grease, white rust or any other contaminants with METALCARE GALVANISED IRON CLEANER to achieve a water break-free surface. Rinse thoroughly with fresh water. Then prime with METALCARE GALVANISED IRON PRIMER. Areas showing red rust must be abraded back to bright metal, patch primed with PLASCOSAFE 18 PRIMER and then the whole surface primed with METALCARE GALVANISED IRON PRIMER.

1.3 Previously painted and weathered: Clean with high-pressure water jet to remove all loose paint, chalk and dirt. Alternatively, clean with wire brushing, scraping, sanding, etc. and then scrub down with hard bristle brush and water. Treat any bare areas as in 1.2 above.

2. Fibre-Cement Sheeting:

2.1 Unpainted and weathered: Remove dust, dirt, loose granules, friable and powdery material with high-pressure water jet or alternatively scrub down with a hard bristle or wire brush and water. Allow surface to dry. Prime with BONDING LIQUID. Allow to dry for at least 4 hrs @ 23°

2.2 Previously painted in good condition: Remove dust, dirt, loose granules, friable and powdery material with high-pressure
water jet or alternatively scrub down with a hard bristle or wire brush and water. Allow surface to dry.

2.3 Previously painted in poor condition: Strip completely. Restore powdery and friable surfaces to a sound condition before painting by applying BONDING LIQUID. Allow to dry for at least 4 hrs @ 23 °C. Apply NUROOF COOL (TRP 200 Range) before contamination of the surface can take place (within 48 hrs).

3. Cement Tiles & Granular Tiles:

3.1 Unpainted and weathered: Remove dust, dirt, loose granules, friable and powdery material with high-pressure water jet or alternatively scrub down with a hard bristle wire brush and water. Allow surface to dry. Prime with BONDING LIQUID as per instructions on the Technical data sheet. Allow to dry for at least 4 hrs @ 23 °C. Apply NUROOF COOL (TRP 200 Range) before contamination of the surface can take place (within 48hrs).

3.2 For previously painted roofs in good condition: Remove dust, dirt, loose granules, friable and powdery material with high-pressure
water jet or alternatively scrub down with a hard bristle or wire brush and water. Allow surface to dry.

3.3 Previously painted in poor condition: Strip completely. Restore powdery and friable surfaces to a sound condition before painting by applying BONDING LIQUID. Allow to dry for at least 4 hrs @ 23 °C. Apply NUROOF COOL (TRP 200 Range) before contamination of the surface can take place (within 48 hrs).

4. Zinc Alum & Aluzinc:

Clean surface thoroughly with POLYCELL SUGAR SOAP POWDER solution. Rinse thoroughly with clean water to neutralise. Allow to dry. Prime with PLASCOSAFE 18 PRIMER.

5. Chromadek:

Clean surface thoroughly with POLYCELL SUGAR SOAP POWDER solution or REMOVALL HIGH STRENGTH CLEANER & DEGREASER and scouring pads to remove chalk. Rinse thoroughly with clean water to neutralise. Allow to dry. Prime with EPIWASH STRONTIUM CHROMATE PRIMER.

6. Special Caution Tiles:

N.B. The painting of clay, slurry coated tiles, slate and wooden shingles is NOT RECOMMENDED.

7. Extremely Porous Surfaces: unpainted cement and well-weathered tiles:

Remove dust, dirt, loose granules, and friable and powdery material with a high-pressure water jet or by scrubbing with a hard bristle or wire brush and water. Allow surface to dry. Apply undiluted BONDING LIQUID (refer to technical data sheet for application details). Allow to dry for at least 4 hrs @ 23 °C before applying NUROOF COOL (TRP 200 Range). Overcoat before contamination of the surface can take place (within 48 hrs).

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