I don't think its a crack either, but plain old rubbing alcohol will verify. Just pour over the area, on the flats or where there is no crack the alcohol will evaporate rather quickly. Where there is a crack, the thin viscosity alcohol will seep into it and not evaporate as quickly leaving what looks like wet lines (which are in fact cracks).
Poor man's dye test/ magna flux test...and it works.
(safety Sam says "no open flame around when using wood alcohol, it will burn you...though you won't see it until its too late.")
Poor man's dye test/ magna flux test...and it works.
(safety Sam says "no open flame around when using wood alcohol, it will burn you...though you won't see it until its too late.")





















































