Penetrant test

Steve welder said

Nothing beats Kroil
We used Kroil in power generation which has very harsh conditions.
Kroil is not readily available in auto parts stores around my parts, plus its expensive
I keep BP blaster on the shelf in the shop

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I wonder why they dont sell it at Autozone? they have a few high dollar items on that same shelf. Old timer told me PB blaster was WD40 with a little acid added. Who knows. Anyone remember Gibbs? They said the stuff would leak out of a normal aerosol can valve.