MrF1 wrote: ↑
Sat Sep 30, 2017 10:37 am
My only concern is whether the one delaminating spot would start expanding over time. I agree....it's all about the sound and playability of the guitar.
It is possible that the whole thing could start flaking, but unlikely. This is caused by a contamination on the wood keeping the finish from sticking to the wood. When a large area or an entire instrument is contaminated and the finish does not stick, there is very little if any outward sign generally, the finish looks fine but once there is some damage and you have that open edge to the unstuck finish, it starts coming off quite easily. Gibson has had this problem a few times over the years on their electrics.
Your photo shows a bubble which tends to suggest the finish on either side of the bubble is well adheared and will not spread. As the guitar neck has dried out abit more post finishing the wood has shrunk and the spot where the finish did not stick has broke loose and bubbled up instead of moving with the wood.
Most luthiers can offer quick cheap non aesthetic fixes for such things to give some insurance against spreading. Or there is Johns suggestion which will make the neck much nicer to thands as well. Although I would not sand poly down, I would scrape it myself. You know how when you unpack something packed in foam peanuts on a dry day and the peanuts stick to everything and everywhere including you. Poly dust is the same, so imagine those peanuts are all smaller then a grain of sand and you have billlons and billions of them.