It looks like the Lucas oil PS Stop Leak and the Blue Devil product require another bottle (or two?) every year or so, assuming they work on the 1st application anyway?
If your leak is due to seals that have shrunk, a little time may be necessary for the stop leak to work on the seals and hopefully recondition them enough that they swell and properly seal.
My present vehicle had a PS leak maybe 4-5 years ago. A single partial fill of Lucas in the PS reservoir was enough and there have been no leaks since.
I also recall that on an older vehicle I had with a PS leak, a single dose of the Lucas into the PS reservoir was enough to fix the leak for several years. That leak never reappeared.
Hope you have similarly good luck.