The PRP is the one from Slice Engineering, so 290C.
I don’t have enough datapoints to claim real statistics, but after the first coating I had to re-apply after the second or third print. Although it’s easy to apply, it does set you back 90 seconds while you wait for it to air dry at ambient before heating the nozzle for a print. I think I’d rather have a nickle plated nozzle, or some other more permanent slick wonder material, but we’re stuck with hardened steel or stainless steel if we stick with Bambulab nozzles. It might warrant changing to a different nozzle ecosystem if there’s one that’s a lot more slippery without painting/re-painting.