Patchiness often occurs because different parts of the wall absorb paint at different rates, especially repaired or filled areas.
Uneven paint loading, poor mixing and rolling over partly dried paint can also create visible differences.
Prepare and prime the wall where needed and maintain a wet edge during application.
Distinguish the patchiness
Visible underlying color, uneven absorption and sheen differences are different defects. Inspect the fully dried wall in frontal and side lighting. Repairs that stand out may indicate uneven preparation or priming; stripes may also relate to tools and losing the wet edge.
A correction plan
First confirm that the surface is free of dust, damp and loose coating. Smooth physical defects, prepare the affected substrate correctly and then recoat the wall as a whole. Repeatedly adding paint to one patch can create thick boundaries. Use the same paint and tool, stir properly and stay within the permitted thinning instructions.
Before correcting the defect
- Assess the defect on a fully dried surface.
- Identify causes of moisture and poor adhesion.
- Trial the selected repair system on a small area.
Does stirring really matter?
Yes: components can separate in the container. Stir as instructed, including the material at the bottom. However, stirring cannot correct poor preparation, moisture or an unsuitable application tool.