It is almost inevitable that you will to repair your walls at some
point, in your home. Your walls are subjected to moving furniture,
the daily rigours of children or even boisterous dinner party guests.
New homes may experience house settling which can cause cracks in the wall.
Even walls that have just been put up may require preparation before
painting. You'd be
surprised the number of blemishes and scuffs they can have. So sand
smooth, dust off and wash down with Polyprep Sugar Soap (Fig. 1).
Check plaster and plasterboard for any nail depressions or cracks
and fill with an interior filler and once dry, sanding back to a smooth,
even finish. Then apply undercoat.
In the case of previously painted
surfaces in good condition, where there's no visible flaking or peeling,
wash down well with Polyprep Sugar Soap to remove dirt, grease and
smoke stains. If there's any mould, then treat the surface with an
anti-mould preparation after washing. Check for any cracks and fill
with an interior filler (Fig. 2), like Polyfilla Multipurpose Interior
Powder Filler for large areas or one of the 5 Polyfilla Ready to Use
Fillers for specific tasks. Once filled and dry, sand back to a smooth,
even finish. If the existing surface is an enamel paint, sand thoroughly
to remove the gloss. Then apply undercoat.
To prepare existing painted
surfaces, which are in poor condition or are obviously damaged, scrape
away flakes and blisters then smooth edges with sandpaper. Touch up
bare areas with an undercoat or primer. Really bad surfaces should
be scraped right back to bare surface (Fig. 3). Use an electric air
stripper (but not around window frames or you'll break the glass)
or chemical paint stripper to soften the old paint, making it easy
to remove with a blade. Polystrippa Renovator's Choice is ideal for
large interior areas where ventilation is restricted. Then sand, wash
down with Polyprep Sugar Soap and treat as for new surfaces. If you're
unsure just how bad the old surface is, try the tape test (Fig. 4).
Scratch the paint and press on a finger length of masking tape. Then
rip it off. If some of the paint comes off with the tape, the surface
should be stripped.