
Paint has been applied without sanding between coats and 'rolling-out' excess paint resulting in compounded stippling.

Paint has been applied with a roller without sanding-out the brush-marks from the previous decoration.
Don't skip the prep
When we decorate a space, around 80% of the time we allocate is for preparation, or 'prep'.
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Tempting as it may be to crack open your new tin of paint and start getting it onto the walls, if the surface you are painting is imperfect, the results will be imperfect which is a terrible waste of time and money.
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Walls must be smooth with no lumps or dents, and no hairline cracks.
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Woodwork must be the same - completely smooth to the touch with no gap at the joins.
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Walls for papering must be prepped as if ready for paint. Contrary to popular belief, lining paper is not for hiding sins; Lining paper is to wallpaper what underlay is to carpet.
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Prep is where the hard-graft of professional decorating lies.
A wall will be sanded to remove all bumps and previous excess paint, any dents filled with Easyfill, cracks filled with decorators' filler, sanded to be smooth, painted with the first coat, sanded to remove high-spots before finally applying the top-coat.
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