If you plan to go that route, poly over a new color, get a test piece done to see if the poly does darken with some age. I think you will find Wipe-On Poly will discolor most enamels quite quickly and that's why I don't recommend it. Depending on the pigment in the base color, it goes yellow or brownish in short order. For whatever reason it will not discolor plastic/celluloid binding or rosettes and I'm sure the formulation was meant for bare wood or sealed/grain filled acoustic guitars. It works quite well, cures nice and hard but it needs about twelve or more coats to get enough finish to cut and buff. It will cut and buff to an amazing finish, though. the poly also seems to lift water based dyes so it can't go over a dye burst, either. I'm not sure about it affecting alcohol-based dyes. I assembled and finished a Hosco(?) brand parlor guitar for a friend some three or so years ago. I used the wipe-on due to no spray booth availability at the time. It was amazing to look at and because a number of glitches were caught before assembly, it plays just as nice as it looks. I need to find a pic of it for reference. I wet cut to 2000 grit, used Meguiars "Tan Bottle" fine cut, followed by swirl remover then show car glaze on it, all by hand.