I've only used it one time as a penetrant, when I sprayed some seat bolts from under the car a couple of weeks in advance of removing the seat. (It was all I had on hand) When I took the seat out the bolts were still oily and came right out. This was in the winter on a 12 yr old vehicle.
Pb blaster seems to dry up too quick so my next can will be another brand, but clp is too expensive for my cars.