If not treated properly, graffiti can re-appear through new paint work. This blog explains how to permanently cover up graffiti stains. Whether you are responsible for the maintenance of a public area or just have some children that insist on using their bedroom walls as a colouring book, Zinsser stain blocking primers can help. By choosing the correct primer to use before re-decorating the area you will ensure that the graffiti stays hidden and doesn’t bleed through.
All surfaces must be clean, dry and free from anything that will interfere with the adhesion of the materials to be applied. Remove loose and failing material by scraping or brushing with a stiff bristle brush to a sound edge. Feather sound edges with a fine grade abrasive paper. Prior to painting, the moisture content should not exceed 18%. Remove all dust. Remove all visible signs of organic growth and treat the areas with Zinsser Mould Killer & Remover in accordance with the manufacturer’s instructions. Allow to dry. In areas with sound paint wash with hot water and liquid detergent solution to remove any contaminants, frequently changing the water. Rinse thoroughly with clean water to remove all residues. Allow to dry. Fill any cracks and small surface defects with Zinsser Ready Patch or Zinsser Ready Patch Lite as appropriate in accordance with the manufacturer’s instructions. Allow to dry. Rub down with a fine grade abrasive paper. Remove all dust.
Prime all areas of graffiti with one full coat of Zinsser B-I-N Primer Sealer in accordance with the manufacturer’s instructions. Allow a minimum drying time of 45 minutes in normal drying conditions.
At this point you can finish the system using your own paints if you wish to bring the colour scheme back in with the rest of the room. Alternatively, decorate with two full coats of Zinsser Perma-White Interior Matt, Satin or Semi-Gloss in accordance with the manufacturer’s instructions. Allow a minimum drying time of two hours between coats.