Have you spotted patterned cracks in the surface of your paint film that resembles alligator scales?
This can be caused by several things:
- The application of an extremely hard, rigid coating (like a solvent-based enamel) over a more flexible coating, like a water-based primer.
- Applying your topcoat before the undercoat is dry.
- The natural aging of oil-based paints as outdoor temperatures fluctuate - the constant expansion and contraction of the paint based on the temperature can result in a loss of paint film elasticity.
Old paint should be completely removed by scraping and sanding the surface. A heat gun can be used to speed up your work on large surfaces, but be careful not to ignite the paint or substrate. Then commence painting following instructions on the can.
More problem solving advice
Have you noticed that there are areas of denser colour or higher gloss where wet and dry layers overlap during painting? For each problem you’ll find a guide to identifying it, its causes and solutions.
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.