Paint not hiding the previous coating Possible Causes Too much thinning of paint than desired Previous paint-coating very dark and topcoat applied without primer-putty primer Recommended number of coats of paint not applied  Poor Coverage Possible Causes Less thinning than recommended Surface being painted is rough or not prepared as recommended Applied more coats than needed Poor quality of application tools  Dust/bittiness on new paintwork Possible Causes Dust or dirt in the atmosphere settling on the surface during or after application. During surface preparation, the surface is not cleaned properly after sanding. Therefore loose particles may get mixed with the paint while application. Use of a dirty application tool.  Poor gloss level in solvent based paints Possible Causes Painting in cold and damp condition, that causes condensation on the newly painted surface. Use of incorrect solvent, contaminated solvent or solvent with traces of water Application of paint in a poorly ventilated room Lack of adherence to manufacturers recommendation for necessary gap between subsequent coats  Sagging/Running of Paint Possible Causes Application of too thick paint coating at a time Over dilution of paint Application of paint on a very smooth surface( without sanding)  Slow Drying Possible Causes Too thick application High humidity and/or low temperature during paint application Improper ventilation, Application being done in confined area Use of contaminated/ improper thinner and not the recommended thinner Lack of adherence to recommended dilution ratio Recommended system usage not adhered to. For instance, not adding adequate hardener in a two pack system like Melamine, PU.  Shade Variation Possible Causes Paint not thoroughly mixed prior to application Application of very thin or thick coat over the surface Use of light top coats over very deep undercoats. Use of colored or dirty thinner for thinning paint sample
Problems During painting  
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