The highly porous and permeable nature of these substrates creates a host of painting challenges. Here we show you how to overcome them on interior projects.
All surfaces must be clean, dry and free from anything that will interfere with the adhesion of the materials to be applied. Remove loose material by scraping or brushing with a stiff bristle brush to a sound edge. Prior to painting, the moisture content should not exceed 18%. Remove all visible signs of organic growth and treat the areas with Zinsser Mould Killer in accordance with the manufacturer’s instructions. Allow to dry. Fill any cracks and small surface defects with a suitable filler as appropriate in accordance with the manufacturer’s instructions. Allow to dry. Rub down with a fine grade abrasive paper. Remove all dust.
Patch prime all bare and filled areas with one coat of Zinsser Grade 1® Primer and Finish in accordance with the manufacturer’s instructions. Allow a minimum drying time of 2 hours in normal drying conditions. Bring forward patch primed areas with one coat of Zinsser Grade 1® Primer and Finish. Allow to dry.
Prime all areas to be decorated with one full coat of Zinsser Grade 1® Primer and Finish. Allow a minimum drying time of 2 hours in normal drying conditions.
Decorate with one or two coats of Zinsser Grade 1® Primer and Finish in accordance with the manufacturer’s instructions.
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