Members companyman Posted December 27, 2013 Members Share Posted December 27, 2013 ... The old Nitro does? I picked up a late 40's - ish ( difficult to date these) Harmony Broadway archtop that has crazing and finish deterioration that looks like the Nitro crazing that I have seen on vintage guitars, I 'm wondering if it is Nitro or something else. It is made of solid birch and sounds/plays so sweetly. Link to comment Share on other sites More sharing options...
Members Shine-ei Posted December 27, 2013 Members Share Posted December 27, 2013 I believe so, if you go from extreme temps really fast it will likely check. Link to comment Share on other sites More sharing options...
Members PurpleTrails Posted December 27, 2013 Members Share Posted December 27, 2013 It is highly unlikely that a '40s guitar used a polyurethane finish, simply because the stuff was pretty experimental back then, and being used for stuff like painting aircraft only. You most likely have a guitar with a nitro finish, which does check as described, while poly doesn't. Link to comment Share on other sites More sharing options...
Members companyman Posted December 28, 2013 Author Members Share Posted December 28, 2013 Yeah that's what I was thinking too... Link to comment Share on other sites More sharing options...
Members Mr.scary96 Posted December 28, 2013 Members Share Posted December 28, 2013 My 39' Stella resonator has checking like you wouldn't believe. Good guitar for slide just I have to guve it a humidifier so it won't fall apart Link to comment Share on other sites More sharing options...
Members Mr.scary96 Posted December 28, 2013 Members Share Posted December 28, 2013 As for poly checking is hard to do assuming its possible to begin with as my uncle sold a 72' strat to me and it has no checking vs his Les Paul deluxe from around the same time period Link to comment Share on other sites More sharing options...
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