Penetrant test
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.
I use WD 40 all the time but never for rust penetration. I buy a gallon and use a sprayer bottle and I find this economical and a better application
Kroil cans, not the spray, and Never Seize cans were literally everywhere to be found in the powerhouse during the 20 plus years I worked there. It was a staple, that they never ran out of, cases upon cases of this stuff, that and Permatex #1 &2.
Your talking about extreme high temperatures, steam, salt water used for cooling, all kinds of equipment
However many parts were so frozen, only heating red with a torch would work
All fasteners had anti seize applied, that was standard procedure
When I went into ship repair, once I was standing on some below deck stiffener, I was about waist high to the decking next to a main engine, it was a tight area.
I had to burn something, I forget. What I didn't know was someone dropped a WD 40 can below me.
The molten metal from what I was cutting hit that WD can and pierced it. Flames shot out about 8 feet inches from my body and face. I was like, what the F is this. The guy above me ran for a fire extinguisher, I couldn't really move, the flames died out has the pressure in the can got weaker
Another learning experience