Spruce Top Worry - Advice Appreciated.

[onemanband]

Hi, not a "worry" really, just an enquiry.
I recently re-fitted an internal Fishman gooseneck microphone, as the previous fitting (Velcro type hook n' loop) was never quite satisfactory and had become loose and unstable.
To try and be sure of a robust and secure mounting this time, I used one of those "Instant grab" adhesives (not superglue), but a creamy textured wood/plastic adhesive that fully cures in 12 hrs.
I've recently noticed however, that when looking across the top of the guitar in certain light and from certain angles, a small, almost insignificant shadow/indentation at the point where the microphone is fixed underneath.
Has this been caused by the adhesive curing and drawing moisture from the wood, causing a small shrinkage, and will this have any adverse effect in the future??
Cheers............Brian

[Jim Bancroft]

I'm not familiar with the adhesive involved, or how it cures, but I'm 99% sure it is not going to cause a problem.
Thin guitar tops can mirror whatever is attached on the inside in many cases.
Some guitars even show the brace outline on the top, where the bracing is glued.

Jim

[onemanband]

Nice one Jim, thanks, well explained.
Here in the UK, one of the leading brand names for this type of adhesive is "no more nails", does that offer a clue?
Look forward to reading any other thoughts on this.
Cheers...........Brian.

[Ned Knepp]

From my amateur point of view, I think the mic is already mounted so, at this point, I would leave it and keep an eye on the top. Removing it now may cause more damage than leaving it might cause and I would bet that the damage incurred in removing it won't change much later IF you need to do so. Just remember to keep an eye on it so it doesn't cause a bunch of damage then have to be removed.
Just my two cents worth.

Ned

[Tim Mace]

If you think you see the outline under certain lighting conditions it's because the top really is thin enough to notice light/dark through the wood. In fact some makers use this to gauge how thick the
plate is in certain areas by looking through the wood so to speak.Spruce is easy to see this when thin enough and .even easier in a darkened environment with a light source inside.If the thing is working well leave it alone.

[onemanband]

Thanks Tim, as you say, the mic. is working perfectly well and I have no intention of messing. My main concern was any further drying out of the wood, leading to problems in the future.
The outline of the actual fixing isn't visible through the wood, it's just a small shadow/indentation in the top, where the mic. is fixed underneath.
Thanks for your help.