Have you noticed that there are areas of denser colour or higher gloss where wet and dry layers overlap during painting?

Possible Cause
This is caused by not maintaining a ‘wet edge’ while painting.
Solution
Invest in a quality synthetic roller sleeve (5mm nap for gloss & semi gloss and 12mm nap for low sheen and flat finish). Do not over load rollers & heavily apply the product or over-spread & work out; which can compromise the finish in both cases.
Prevention
To maintain a wet edge, apply your paint towards the unpainted area and then back into the just-painted surface. Brushing from wet to dry, rather than the other way around will help produce a smooth, uniform appearance. It’s also wise to minimise the area being painted and plan for interruptions at a natural break, such as a window, door or corner.
More problem solving advice
Mould
If you’ve noticed black, grey or brown areas on your painted surface, chances are you’re dealing with a mould problem. For each problem you’ll find a guide to identifying it, its causes and solutions.
Cracking / flaking
Cracking or flaking is the splitting of a dry paint film. This is a problem that needs fixing as it can lead to complete failure of the paint. For each problem you’ll find a guide to identifying it, its causes and solutions.
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Solve Paint Lapping Problems | Dulux