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Prep for powder coating: black iron pipe with 'lacquer coating'

Q. We are trying to powder coat black iron pipe with a black lacquer type finish on it. We prepped a few pieces like we do carbon steel. When it came out of the oven there was a 1" X 1/2" spot that appeared to bubble a little and no powder on it. The rest of the pipe looks good. The lacquer finish on the pipe from the mill is rough by nature. My question is how do we prep the pipe? We don't sandblast or have money in the job to get it sandblasted outside.

Bob Dixson
- Anderson, South Carolina
September 29, 2015

September 30, 2015

A. Like to help but insufficient info provided.
What is your normal preparatory process?
Most Lacquer finishes will not tolerate Powder Cure Schedules.
Normally, the lacquer would need to be totally removed by either abrasive or chemical means before a phosphate pre-treat and powder application process.
Perhaps if you could give more detail we could further assist.
Hope this helps.
Regards,
Bill

William Doherty
Trainer - Newcastle, NSW Australia

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