Problem Solving Guide
| PROBLEM | APPEARANCE |
|---|---|
| Adhesion Loss |
Coating peeling from substrate or the previous coat |
| Bleeding |
Coating discoloured |
| Blooming |
Cloudy haze on top of the coating |
| Blushing |
Cloudy haze in the coating |
| Brittleness (linked with lack of adhesion) |
Coating chipping or cracking from substrate or previous coat |
| Bubbling (also called solvent boil or aeration) |
Bubbles in the coating |
| Champagning |
Coating efforvessing like champagne |
| Cissing (also called cratering or fish eyes) |
Coating drawing away in circular fashion from the substrate |
| Cob-Webbing |
White “cob-web” trails being sprayed from the gun |
| Cracking or Crazing |
Coating or substrate cracking or crazing |
| Dirty or seedy finish |
Dirt, dust or overspray in the coating |
| Discolouration |
Substrate or clear coating changing colour |
| Fat Edge |
Ridge of accumulated coating on the edge of the substrate |
| Flotation |
Separation of the pigment in the dry or liquid coating |
| Flow |
Uneven appearance when dry |
| Frying |
The dry surface of the coating pulls back resulting in raised ridges that can be seen and felt |
| Marring of Film |
Coating film easily marked |
| Opacity (poor) |
Substrate or previous coats showing through the last coat |
| Orange Peel |
Uneven finish that resembles the skin of an orange |
| Overspray (also called dry spray) |
Dry paint particles that have been sprayed and not formed a smooth film, resulting in a rough sandy feel and appearance |
| Patchy Colours |
Blotchy and uneven stains |
| Patchy Gloss Levels |
High and low gloss spots in the dried coating |
| Pinholing |
Small pinholes visible in the dry coating |
| Premature degradation of the coating system |
Coating cracking, lifting, delaminating etc |
| Printing |
Defects in the film after transporting |
| Sagging (or runs) |
Coating moves and runs on vertical surfaces |
| Settling |
Separation of coating in the can or pail |
| Sink Back |
Noticeable defects in the dry film |
| Slow Drying |
Coating tacky or wet after the recommended drying time has elapsed |
| Streaking (in pigmented finishes) |
Lines of differing colours in the dried coating |
| Streaking (in metallic or textured finishes) |
Lines of metallic or textured streaks in the dried coating |
| Thickening (also called bodying) |
Coating becomes thicker in the can over time |