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Painting and Decorating NVQ and Technical Certificate Level 2, 2nd Edition
You can clean off rust by hand, using a wire brush, paint scraper, chipping hammer or abrasives – or a combination of all of these!• Remove traces of oil and grease.• Scrape off all loose rust.• Use a chipping hammer around rusted
nails, etc.• Use a wire brush, but avoid burnishing.• Finish off with a rough aluminium oxide
Painting and Decorating NVQ and Technical Certificate Level 2, 2nd Edition
It is quicker and more effective to use power tools to remove rust – but take care not to over-polish the surface.• Remove traces of oil and grease.• Scrape off all loose rust.• Use a needle gun to remove rust
around corroded nuts, etc.• Select appropriate method:
Painting and Decorating NVQ and Technical Certificate Level 2, 2nd Edition
Abrading surfacesAbrading means wearing away the top layer by rubbing. This provides a key for the coating or covering to be applied to, and gives a good quality finish. Abrasive materials need to be:• not too rough – this can leave scratches• not too fine – this may be ineffective• of good quality – cheap ones don’t work
well!
What are wet and dry abrasives? What are dry abrasives?
Painting and Decorating NVQ and Technical Certificate Level 2, 2nd Edition
Mechanical sanders can be quicker and more effective than manual sanding techniques, but may only be suitable for certain areas – and can create a lot of dust.
When is it best to use a heavy duty sander, and when a rotary sander?
Painting and Decorating NVQ and Technical Certificate Level 2, 2nd Edition
A friable surface is one that crumbles away easily when you rub your hand over it, such as weathered brickwork. If paint is applied to a friable surface, it won’t last very long as it will come off as the surface crumbles.
How should you treat a friable surface before painting it?
Painting and Decorating NVQ and Technical Certificate Level 2, 2nd Edition
Defective puttyIf you notice a gap between the old putty and the glass, you must seal it completely by forcing in linseed oil putty using a putty knife.
Painting and Decorating NVQ and Technical Certificate Level 2, 2nd Edition
Apply a hard waterproof coating to plasterboard before applying surface coverings like wallpaper. This will stop the covering bonding with the surface, and prevent damage if the wallpaper is removed later.
Painting and Decorating NVQ and Technical Certificate Level 2, 2nd Edition
Moisture penetrates cement, dissolving some of the lime, creating calcium hydroxide which rises to the surface as a white patch. Remove any efflorescence with a stiff fibre brush or wire brush before decorating.
Painting and Decorating NVQ and Technical Certificate Level 2, 2nd Edition
Caulk is a waterproof filler and sealant, used in cracks and gaps. Mastic is one sort of caulk. To apply caulk correctly:• apply the caulk, usually with a gun• wipe across the bead with a wet finger• remove any surplus with a filling knife• sponge off any remaining material.
Why is one of the applications on the right incorrect?