Surface Preparation Guide for Wall & All
Ensure that surfaces are dry, sound, and free from dust, dirt, grease and oil before painting.
1. New Work:
1.1 Cement plaster, concrete and unglazed brickwork: Ensure that concrete has dried for at least four weeks and other masonry surfaces two weeks before painting. Remove any loose particles and laitance by most suitable means. Remove any oil, grease and mould release agents with PLASCON AQUASOLV DEGREASER. Rinse thoroughly. N.B. Soft, underbound, friable and highly porous surfaces must be restored to a sound condition with PLASCON MULTI-SURFACE PRIMER or PLASCON PLASTER PRIMER.
1.2 Fibre-cement: Remove any loose particles and laitance by most suitable means. Apply 1 coat of PLASCON BONDING LIQUID. Allow to dry for 16 hours. N.B. BONDING LIQUID must be overcoated within 3 days after application.
1.3 Gypsum plaster (e.g. Rhinolite, Cretestone): Apply one coat of PLASCON PLASTER PRIMER. If a gypsum plaster has been used as the joint skimming filler on gypsum board or dry wall partitioning, then these areas must be sealed with PLASCON PLASTER PRIMER.
1.4 Wood: Sand smooth with 150 grit paper working in the direction of the grain. Dust off. Seal knots and resinous areas with PLASCON KNOT SEAL. Prime exterior wood with PLASCON WOOD PRIMER.
1.5 Mild steel: Degrease with PLASCON AQUASOLV DEGREASER. Rinse thoroughly with water. Remove any rust by coarse sanding, mechanical grinding, etc. or PLASCON RUST REMOVER. Prime general surfaces the same day with PLASCON METAL PRIMER or PLASCOSAFE 18 PRIMER – use ZINC PHOSPHATE PRIMER RED OXIDE for structural steelwork.
1.6 Galvanised steel: Clean with PLASCON GALVANISED IRON CLEANER to achieve a water break-free surface. Rinse thoroughly with water. Prime the same day with PLASCON GALVANISED IRON PRIMER.
1.7 PVC gutters and down pipes: Clean and sand lightly. Prime with PLASCON PLASTER PRIMER or PLASCON MULTI SURFACE PRIMER.
2. Previously Painted Surfaces:
2.1 Previously painted surfaces in good condition: Remove loose and flaking paint back to a sound substrate and a firm edge by scraping and sanding. Spot prime bare areas with appropriate primer. Clean with POLYCELL SUGAR SOAP POWDER solution to remove all contaminants and chalked material. Rinse with clean water to remove all traces of SUGAR SOAP. Alternatively, clean with high pressure water jet. Sand glossy enamel surfaces to a matt finish to aid adhesion.
2.2 Chalky surfaces: Remove completely by scraping, wire brushing, sandpapering, etc. to expose the underlying substrate. Apply PLASCON BONDING LIQUID or PLASCON PLASTER PRIMER. N.B. BONDING LIQUID must be allowed to dry for 16 hrs and overcoated within 3 days after application.
2.3 Previously painted surfaces in poor condition: Completely remove paint by most appropriate means or by stripping with REMOVALL ALL PURPOSE COATINGS REMOVER. Treat as for new work.
Fill defects with POLYCELL POLYFILLA MENDALL 90, POLYFILLA INTERIOR or EXTERIOR as appropriate. Seal POLYFILLA EXTERIOR with PLASCON PLASTER PRIMER. Fill wood with POLYCELL POLYFILLA MENDALL 90 and seal with PLASCON PLASTER PRIMER.