Dripless since 1994
I installed some Drip Free packing (the teflon clay) in 1994. In those days it was advertised as being "permanent". I think West's current designation as multi-season is probably more accurate, but mine STILL doesn't leak! I do have to tighten it about once a year, and I do tighten it a BIT more than the old flax packing. It heats up, somewhat, but with the teflon it doesn't seem to matter. I had my shaft out last October and it was spotless. I have also been told that the PSS seals and the Lasdrops depend on perfect alignment and centering in the stern tube. Apparently, lots of older boats (mine included) do not have perfectly centered shafts, since it was not necessary with flax packing. But, however you do it, I vote for a dry bilge.