CURING POR 15

I just noticed as ad this AM POR 15, it was ilke $43 a PINT!!!! Might have been in Summit ad maybe? IT is darn expensive andalways as been.
SPI epoxy primer comes in at $206 for 2 gal mixed. I will put that up against anything, topcoated with any good acrylic urethane or even cheap *** RustOleum that is now up to what about $35 a gal? Maybe POR!15 is great where brake fluid hits it!?
I have no hound in the race, just know works for me, and not talking one car either.