The specific requirements for each PMI test technique
should be clearly reviewed as to the amount of mechanical
preparation. Consideration should be given to the anticipated
thickness of the sample before mechanical methods are used
to prepare the sample. In addition, considerations for electrical
arcing and “hot spots” should be considered as well as appropriate
electrical and hot work permits. Chemical spot testing
involves the use of a variety of chemicals. Appropriate safety
precautions should be taken when handling these chemicals