STEP TO APPLY:
1) make sure the components is clean and dry (vapour cleaning, solvent cleaning, ultrasonic cleaning)
2) liquid with high surface wetting characteristics is applied to the surface of a components under test (brushing, spraying, dipping/immersing, flow-on)
3) the penetrant penetrates into surface-brekaing discontinuities via capillay action (named as dwell time)
4) then, the excess penetrant is removes from the surface
5) next, deloper is applied to pull the trapped penetrant back to the surface
6) with good inspection, visual indication of any discontinuities present can be seen.
