The Hub

New to the Looth Group forum so I hope I'm posting in the right place. I am also relatively new to the trade although I've been a woodworker for a long while. I have a general question for luthiers regarding the repair of a typical pick guard issue. I have 2 early 1970's Martin D35's in my shop with the usual pick guard curling and cracks associated with shrinkage. I've watched luthiers flatten and re-glue these back on the bare wood as they were done back in the day, and I've watched others "seal" the wood where the original guard was with super glue and/or lacquer and apply a newly made guard.

My question is how are most people approaching this. Is re-gluing on bare wood really the best way for the guitar in the long run given the fact that most builders would not consider doing such a thing currently, (I think?). I understand that with these two guitars gluing to bare wood would be the more original way to restore the instruments but for the health and tone of the instrument wouldn't it be better to apply a pick guard that allows for more wood movement and flexibility? Would it matter if these instruments were more of a players guitar rather than a collectable one?

On a slightly different tack I also have a 90's Gibson J-180 Everly Brothers model which is a whole lotta pick guard. It's lifting in some places but not all over and I'd like to ask which glue folks would choose to seat it down.

Any help would be much appreciated. Thanks.