Surface Preparation Guide for Velvaglo
Ensure that surfaces are dry, sound, and free from dust, dirt, grease and oil before painting.
1. New Work:
1.1 Cement plaster, concrete, fibre-cement, unglazed brick, Gypsum plaster (e.g. Rhinolite, Cretestone): Prime with PLASCON PLASTER PRIMER (UC 56) or PLASCON MULTI SURFACE PRIMER (WUP 1) in order to obtain an unbroken barrier coat to seal alkaline surfaces properly.
1.2 Wood: Seal knots with PLASCON WOODCARE KNOT SEAL (PK 2). Then prime with PLASCON WOOD PRIMER (UC 2). N.B. WOOD PRIMER may be omitted for interior surfaces.
1.3 Hardboard: Prime with PLASCON PLASTER PRIMER (UC 56).
1.4 Mild steel: Degrease with PLASCON AQUASOLV DEGREASER (GR 1) and rinse thoroughly with water. Remove any rust by coarse sanding, mechanical grinding or with PLASCON RUST REMOVER (RR 1). Prime general surfaces with PLASCON METAL PRIMER (UC 501). Use ZINC PHOSPHATE PRIMER RED OXIDE (UC 207) for structural steelwork. N.B. Mill scale must be removed by abrasive blasting or mechanical grinding before coating.
1.5 Galvanised steel: Clean with PLASCON GALVANISED IRON CLEANER (GIC 1) and rinse thoroughly with water to achieve a water break-free surface. Remove any red rust with scouring pads or sanding back to bright metal. Spot prime areas where rust has been removed with COASTCOTE ETCH PRIMER RED OXIDE (SNK 2) or PLASCOSAFE 18 PRIMER (EMS 18). Prime the entire surface with PLASCON GALVANISED IRON PRIMER (GIP 1).
N.B. When overcoating water based primers with solvent based topcoats, allow a 24 hour period for drying and curing.
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. Rinse with clean water to remove all traces of SUGAR SOAP. Sand glossy enamel surfaces thoroughly to an even matt finish, dust off and apply one coat of PLASCON UNIVERSAL UNDERCOAT (UC 1).
2.2 Previously painted surfaces in poor condition: Completely remove paint by most appropriate means e.g. scraping, course sanding or stripping with REMOVALL ALL PURPOSE COATING REMOVER (RRA 220). Wash thoroughly with POLYCELL SUGAR SOAP POWDER solution. Rinse with fresh water. Proceed as for new work.
2.3 Chalky surfaces: Remove as much of the chalky surface as possible. Seal with PLASCON BONDING LIQUID (CVI 14) and allow to dry for 16 hours.
Fill defects with POLYCELL POLYFILLA MENDALL 90, POLYFILLA INTERIOR or POLYFILLA EXTERIOR as appropriate. Seal POLYFILLA EXTERIOR with PLASCON PLASTER PRIMER (UC 56). Fill wood with POLYCELL POLYFILLA MENDALL 90 and seal with PLASCON PLASTER PRIMER (UC 56).