On the subject of Lunsford-Alden "Pin-Tite", I've used it with success
on a few pianos over the last five years. I treated a cheap spinet
with it (as per the instructions on the bottle), laying the piano on
its back and repeatedly soaking each pin, keeping the liquid off of
the string and the plate. I've been tuning this piano since the
application (1995), and none of the pins are extremely loose.
I've also treated a couple of school pianos (1970's Baldwin consoles),
but with these it's mainly been for scattered loose pins and not the
entire pin block. They're also tuning and holding adequately.
I prefer not to use it, but it's a good, inexpensive stop-gap measure
if you're not ready to re-pin the whole piano.
Armstrong Piano Tuning & Repair
2053 24th St. SW, Pine River, MN 56474