New : Surfaces must be sound, clean, dry and free from all defective or poorly adhering material, dirt, grease or wax. To have better finish rubbed down surface using suitable abrasive and dust off. If after thorough preparation surface remain powdery, or suffer from alkali attack. For best effect seal with one coat of appropriate primer.
Repainting : Remove all loose, defective and unstable paint film or powdery residues by thorough brushing and scraping. High Pressure Water Jet is highly recommended. Treat areas effected by mould, lichens, algae and moss with any fungicidal wash. Make good minor defects and crack with suitable Exterior Grade Filler.