Blisted paint on air compressor head

[slackdaddy1]

I picked up a IR T30 compressor (2340 pump), it had a burnt motor and the pump to tank copper line was Severely bent/crimped.
The heads of the pump have blistered paint. it I scape off the blisters, there is grey paint under, so not blistered to the raw metal. almost like there was 2 coats of paint and the top one blistered. THe blistering is only on the cylinders and gets heavier at the tops.
The blisters/paint is hard and brittle and can be scraped off with the finger nail.
I "assumed" the discharge line got damaged/kinked and it overheated/overloaded the compressor, burning out the motor.
I picked the whole thing up dirt cheap, as the pump turned freely, the oil was not burnt and the tank was in pristeen condition.

I have replaced the motor and run it for 5 min and all seams ok.

Has anyone else seen a compressor with this blistering?

Slack

 

[IowaDon]

It's doubtful the the brass elbow and copper discharge line were painted at the factory. I would guess a previous owner did a shoddy repaint and now it's coming off.

It would make sense that an obstructed discharge line would damage the motor before it could hurt the pump. Factor in the belt that would start slipping and squealing, I'll bet that the pump is fine. If it ran fine for 5 minutes, I would continue to run it.