Painting problems
30 November -0001
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A well paintes wall or piece of furniture can look great, but all too often DIY painters get left with brushmarks, drips, runs and other problems.
Here are the top problems fro B&Q And how to avoid them.
- Brushmarks
Failing to rub smooth a poor surface or using a low-grade brush with an inadequate amount of bristles are basic faults. Wash surfaces thoroughly, rub down, then wipe with a lint-free cloth dampened with white spirit. - Flaking
Poor surface preparation can cause paint to flake away. On woodwork, painting over dust and grease is the likely cause. Remove wax polish from skirtings. On walls and ceilings, applying emulsion over an unclean surface, old distemper or dampness is the fault.
If distemper is present it has to be removed or sealed. You will only find distemper in older houses which have not been decorated for many years. If you suspect it might be present, test by wetting it with water - if it's distemper, the water will dissolve it and it will come away. Wet and scrape away any loose distemper, then apply a plaster sealer. - No hiding power
If the previous coat is still visible, then it is likely that no undercoat has been used, or the undercoat was the wrong colour. Overthinning the paint, overbrushing, or understirring can also be the cause. Where necessary, use an extra undercoat. - Loss of gloss
When gloss paint loses its shine, not allowing sufficient drying time between coats can be the problem. Overbrushing the paint or overthinning the paint may also be causes. Painting in very cold conditions is another factor. - Runs
If the paint is applied too thickly or is not brushed out enough, then runs and wrinkles will result. A common cause is trying to paint around fittings such as door handles. Apart from the likelihood of smudging paint onto the fitting, it is far better to remove all fittings before painting.
The only remedy is to allow the paint to harden for a week, then rub down smooth with wet-and-dry paper before repainting. - Specks and pimples
Caused by dust and specks getting into the paint. In outside work especially, wind-blown dust can get into the paint tin contaminating the whole batch. This can be avoided by transferring small amounts of paint into a paint kettle - so if dust does get in, only a little will be affected and this can be discarded.
Remove dust from the lid of the paint tin. Dust on surfaces can also be picked up on the brush bristles and spread onto the work. - Blisters
These are caused by painting on a wet surface, or onto old, soft or lifting paint. Again, treat the problem as for runs. - Yellow stains on gloss
This happens when resin from a knot in the surface of wood starts to bleed through to the paint surface. This is prevented by coating the knots with a liquid called shellac knotting which is effectively a sealer. If staining occurs, you have to strip off the paint and redecorate. - Damp patches
Where dampness caused by rainwater or a plumbing leak leaves a stain on a wall or ceiling, painting over it will not solve the problem as the patch will reappear. Large areas should be coated with aluminium primer sealer before using emulsion; for economy, where only a small area is concerned, you can use an aerosol - Fluff on paint
Usually the result of someone's fluffy clothes brushing against the wet paint. Typically, this happens when painting a door and leaning against a wet door frame. This can be avoided by painting the door and frame on different days. Proceed as for treating runs. - Equipment
Buy good-quality brushes. These have long, densely packed bristles which hold the paint well and give good coverage. Poor-quality brushes have short, sparse bristles which give uneven coverage.
A good-quality brush, if looked after, will last a long time and prove more economical in the end.
Even a top-quality brush will shed a few bristles at first. So, before using it, dampen it in clean water and run it over clean brickwork to get rid of dust and loose bristles.
Buy a good-quality roller as it will give even coverage. A poor-quality foam roller will give uneven coverage and tends to spatter the paint around.
Match the roller to the surface - the smoother the surface, the shorter the roller pile needs to be. A heavily textured surface needs a shaggy sheepskin-style roller.
Paint pads can give uneven coverage by being incorrectly loaded. It's best to buy a special tray which has a roller on one side; if the pad is dragged across, even coverage is virtually assured.Videos you might like
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