Pretreatment is the base for powder coating. It is said that you can not make a good coating work with poor pretreatment. Hence utmost care should be taken to ensure proper pretreatment is applied before powder coating.

Proper pretreatment means application of the right process and proper maintenance of the chemicals.

PROBLEMS BECAUSE OF IMPROPER CLEANING :-

1. Appearance of oily patches.
2. Appearance of pin holes.
3. Appearance of rusty surface beneath powder coating film.

PROBLEMS BECAUSE OF IMPROPER CONVERSION COATING :-

1. Reduced resistance to weather.
2. Reduced mechanical resistance.
3. Poor finish of the powder coating film.

PROBLEMS BECAUSE OF IMPROPER DRYING :-

1. Appearance of pin holes.
2. Poor bonding of the powder coating film.

These problems can be avoided by the choice of right process – right chemicals and proper maintenance of the chemicals.