Preparation is the heart of the matter. It not only speeds up the finishing coats but lays a smooth base, ensuring a fine result.
Sand smooth, dust off and wash down with sugar soap. Prime timber surfaces before repairing any faults.
Check plaster and plasterboard for any nail depressions or cracks and overfill with an interior filler,
Scrape away flakes and blisters then smooth with sandpaper.
Touch up bare areas with an undercoat or primer.
Really bad paintwork should be scraped right back to the bare surface.