A friend claims that there is a correct way to use Pin-Tite.  He says
that while a single application can appear to work, it has only affected
the top quarter inch or so of the pinblock.  Clearly, if it is to be
effective, it must work on the wood the length of the pin.

Tilt your upright in a place where you can leave it for six months.
Apply Pin-Tite with a hypodermic needle or similar device so that you
don't slobber it all around.  Put it on weekly for months, then let it
just set for a while longer.

I've never used this method myself.  My tuner thinks it's crazy, and says
he does not like to tune doped pianos.  But my friend claims it has
worked on his pianos.