Question: can you mpi through paint?
Answer: You can mag through coatings According to ASTM E709-15, “Thin nonconductive coatings, such as paint in the order of 1 or 2 mil (0.02 to 0.05 mm) will not normally interfere with the formation of indications, but they must be removed at all points where electrical contact is to be made for direct magnetization.”