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Chemical Paints

Failure of paint

The main reasons of paint failure after application on surface are the applicator and improper treatment of surface.

Application Defects can be attributed to:

Dilution

This usually occurs when the dilution of the paint is not done as per manufacturer’s recommendation. There can be a case of over dilution and under dilution, as well as dilution with the incorrect diluents.

Contamination

Foreign contaminants added without the manufacturers consent which results in various film defects.

Peeling/Blistering

Commonly, due to improper surface treatment before application. And inherent moisture/dampness being present in the substrate.

Chalking

Chalking is the progressive powdering of the paint film on the paint ed surface. The primary reason for the problem is polymer degradation of the paint matrix due to exposure of UV radiation in sunshine and condensation from dew. The degree of chalking varies as epoxies react quickly while acrylics and polyurethanes can remain unchanged for long periods. The degree of chalking can be assessed according to International Standard ISO 4628 Part 6 or 7 or American Society of Testing and Materials(ASTM) Method D4214 (Standard Test Methods for Evaluating the Degree of Chalking of Exterior paint Films).

Cracking

Cracking of paint film is due to the unequal expansion or contraction of paint coats. It usually happens when the coats of the paint are not allowed to cure/dry completely before the next coat is applied. The degree of cracking can be assessed according to International Standard ISO 4628 Part 4 or ASTM Method D661 (Standard Test Method for Evaluating Degree of Cracking of Exterior paint s).

Erosion

Erosion is very quick chalking. It occurs due to external agents like air,water etc. It can be evaluated using ASTM Method ASTM D662 (Standard Test Method for Evaluating Degree of Erosion of Exterior paint s).

Blistering Blistering is due to improper surface exposure of paint to strong sunshine. The degree of blistering can be assessed according to ISO 4628 Part 2 or ASTM Method D714 (Standard Test Method for Evaluating Degree of Blistering of paint s).

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