One common problem observed over the years with machine tools is paint peeling off after contact with the metalworking fluid.  This is common knowledge and many companies have learned to perform paint compatibility test with new fluids before shop testing.  However, metalworking fluid is like your teenage son - easy to blame but not always at fault.  (Trust me on this).  The type of failure is instructive.  With a simple analytical view of the failure mode and the compositions of the fluid and the paint, the root problem can be identified and solved.  The quality of paint and working conditions can be equally responsible. This Cimcool  Technical Report provides the simple review you need to read.  Cimcool; when these guys aren't killing guinea pigs, they are providing as much useable information to the End User as just about anybody else in the world.  Their series of Technical Reports are among the best resources.