Also known as grains, specks, grit, nibs, bits and dirt inclusions. This defect will show particles in the coating. These particles can range from large to small.
- Dust/dirt/contamination from sanding, cloths, the applicator, nearby equipment etc.
- Dried spray dust accumulation in the booth
- Electro-static attraction of dust to the surface. A static charge on a surface attracts dust and small particles. Many of the HMG degreasers are anti-static to aid with this issue.
- Use of low quality masking tape.
- Tack rag not used immediately before application, (or sometimes at all).
- Contaminated/poorly filtered air lines
- Paint kept in dirty paint cans
- Failure to remove any "skins" that may have formed in synthetic finishes. This is generally only when the can have been opened and closed allowing air to the product.
- Paint was not sieved/strained before use
- Paint has been kept longer than its shelf life, (see technical data of specific product).
- Incorrect thinner or hardener used.
- Tinters not adequately stirred/shaken into base
- Using re thinned two pack materials after the recommended "pot life".
- Dirt, contaminants, oil and dust blown out of crevices and cracks such as wheel arches, seams, door shuts etc.
- Keep the spraying area as clean as possible and free of dirt and rubbish. Clean tyvek suit overalls, (available from HMG) should be worn.
- Spray booth filters should be changed regularly.
- Blow out seams, cracks, wheel arches etc
- Use a tack rag immediately before application
- Carefully remove skin that may have formed in previously opened paint.
- Make sure equipment such as air lines, spray guns and filters are well maintained and cared for.
- Clean the surface before starting the job!
- Mix in tinters to base thoroughly before usage.
- The material should be strained before use
- Do not exceed recommended pot life
- Use an anti-static degreaser especially on non-metallic surfaces
Minor cases of dirt can be rectified by a fine compound solution and polishing. For more severe cases sanding and refinishing may be necessary.