I used Minwax wipe on poly on two Carvins. Applied with folded paper towel and wiped off before tacking. Did this repeatedly, didn't seem to build but the finish is still holding. Oh, and gloss free.
I'm hearing some vicious grind - big tube and some intense speaker breakup. Sounds clean otherwise. Cranked no master volume. I'm almost ready to mail the guy on his teaching gig. :D