The presence of small particles, fibre, grit, or lumps trapped in the dried paint surface, resulting in a rough or coarse texture instead of a smooth, even finish.
Causes:
- Poor surface preparation – dirt, dust, or sanding residue not removed before painting.
- Contaminated tools or containers – dirty brushes, rollers, or paint tins introducing grit.
- Impurities in the paint – dried skin, lumps, or foreign particles mixed into the product.
- Failure to strain paint – not filtering paint before use, especially older or opened tins.
- Environmental contamination – airborne dust, insects, or debris settling on wet paint.
- Inadequate mixing – pigments or additives not fully dispersed, leaving clumps.
- Use of low-quality or old paint – degraded binders and pigments forming particles.
- Application in windy or dusty conditions – external grit blown onto wet surfaces.
Fixing Bittiness in a Paint Film
Step 1 – Let the Paint Dry
- Wait until the paint film is completely dry before starting repairs.
- This prevents smudging or smearing during sanding.
Step 2 – Sand Smooth
- Use fine-grade sandpaper (240–320 grit).
- Gently sand the affected area until the surface feels smooth to the touch.
- Feather the edges so the repair blends with surrounding areas.
Step 3 – Clean the Surface
- Remove all sanding dust using a vacuum, damp rag, or tack cloth.
- Ensure the surface is free from grit, dirt, or loose particles.
Step 4 – Strain the Paint
- Pour paint through a strainer, mesh, or even a nylon stocking.
- This removes dried skin, lumps, and impurities that cause bittiness.
Step 5 – Prepare Clean Tools
- Wash brushes, rollers, and trays thoroughly before reuse.
- Avoid using old or contaminated equipment.
Step 6 – Reapply Paint
- Apply a smooth, even coat in a dust-free environment.
- Avoid painting in windy or dusty conditions.
- Work methodically to achieve a uniform finish.
Step 7 – Inspect the Finish
- Once dry, check the surface for smoothness.
- If needed, repeat sanding and recoating for a flawless result.
