Lots of people. Some with good results, some with bad. If you
can get the tank super clean inside, slosh it and make sure it
has a good long time to cure then it renders an other wise
scrap tank into a usable one. The bad side is if you don't get
it super clean the liner can come loose and plug your line.
Personal opinion, if a tank is sprouting pin holes then that
indicates to me the it's getting to thin to be safe. I'd opt
for a new tank, they taint all that expensive and you can have
your FLAPS order one and have it in a few days.
Denny G