Also known as ‘flashing’, poor sheen uniformity can be identified as shiny or dull spots on a painted surface that can lead to an uneven gloss.
Possible causes of flashing:
• Uneven spread rate whilst painting
• Failing to properly prime a porous surface
• Poor paint application that results in lapping (see Lapping)
New substrates should always be primed and sealed before applying the top coat to ensure a uniformly porous surface. Without the use of a primer or sealer, it’s likely you’ll need an additional coat of paint to even out any sheen irregularities. Make sure you always apply paint from 'wet to dry' to prevent lapping.
More problem solving advice
Yellowing is the development of a yellow cast in aging solvent-based enamels. It’s most noticeable in the dried films of white paints or clear varnishes. For each problem you’ll find a guide to identifying it, its causes and solutions.
Have you noticed small droplets appearing on your fresh coat of acrylic paint? This is known as 'surfactant leaching'. Don't panic - it's a normal part of the curing process. For each problem you’ll find a guide to identifying it, its causes and solutions.