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Paint peel off from cast iron object

The problem is Paint peels off from cast iron object. We first phosphate it abd then apply paint. Hoever in some 5-6% of cases the paint fails to stick on part of the object and peels off.

Javed Lodi
Sr. Manager-QA - Karachi, Sind, Pakistan
2004

It's hard to say, but they are probably not clean. Try scrubbing a number with pumice [on eBay or Amazon], detergent, and a tampico brush and see if the problem goes away.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2003

This is clearly a pre-cleaning issue. Clean it with a good detergent so that there is no oil stains and properly dry the part before paint application.

V S Magesh Valsala Kumar
- Chennai, India
2004

The root cause must be contamination. After phosphating,there may be chances of moisture, oil or grease contamination while handling or storage. Pl try pre heating the component in an oven for 40 °C for 5 minutes and then paint.

Prabhu Ram
- India
2004

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