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PAINT DEFECTS.

12/05/2013

These defects may occur due to poor or incorrect preparation of the surface, poor application of the paint and/or chemical reactions. The general remedy is to remove all the affected paint and carry out the correct preparation of the surface before applying in the correct manner new coats of paint. Most paint defects are visual and therefore an accurate diagnosis of the cause must be established before any remedial treatment is undertaken. The defects which occur are;
 
1. Bleeding: this is blemish of the paint surface by chemical action, mainly caused by applying an incorrect paint over another.
 
2. Blistering: this is a formation of small bubbles which is caused by allowing resin or moisture to be entrapped, the subsequent expansion causing the defect.


3. Blooming: this is caused by presence of moisture during application. It can be avoided by not painting under these conditions.
 
4. Chalking: this is powdering of the paint surface due to natural ageing or the use of poor quality paint.
 
5. Cracking: this is mainly caused by deformation of successive coats of paint.
 
6. Peeling: this is caused by poor adhesion, presence of moisture, painting over unclean areas or poor preparation.
 
7. Grinning: this is due to poor opacity of paint which allow paint coat below to show through, sometimes is the result of poor application, incorrect thinning or the use of the wrong color.
 
8. Saponification: this is the formation of soap from alkali present in or on surface painted. The paint is ultimately destroyed and a brown liquid appears on the surface.

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