What glue to use ?

Take a look at the Lee Valley catalog online. They have a special glue for every thing!
I picked up some that is specifically made to penetrate thin cracks. Haven't unpacked my gun room stuff yet so can't get you the name but it's pretty easy to find.
 
That sounds like "Chair Doctor" glue. Got some and it's great for firming up wooden stools and chairs that have busted loose the socket joints or tenons inside their mortises.

Oddly enough though it's not that great for fixing cracks of this sort. Not sure why but it doesn't seem to have the same strength against splitting loads. Tried it on a crack and the crack just split open again under use. And it wasn't on a gun stock where old gun oil could be the culprit either.
 
warming up the epoxy will get it to flow better but will shorten the working time (cures much faster). I've done it a few times on finer cracks, you can also warm the stock first, gently, with a heat gun. That will also help.
 
I have had great success with the cyanoacrylate (sp?) glues. I use the type from Lee Valley and use the thinnest variety with a syringe (needle) you insert the needle into the small crack and inject. That stuff will come out in places you never expect. But you tube it up tight and you will be hard pressed to find any sign of the small cracks if the conditions were right. Also, you know from where it flowed that it got many of the small cracks within the wood that you did not know existed.


Open cracks from drying are another matter. A thicker cyano glue can work to fill gaps.

I rub in sawdust to the open, glued cracks and it comes out good to sometimes a little too visible. But it works for me.
 
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ZAP CA (Pink Label) Thin Viscosity is a cyanoacrylates (CA) glue. Another good characteristic about it is that it does not expand which is very important if you want it to wick/penetrate into very fine cracks.
 
Good advice from Donny and a few others about heating the epoxy. Some of those cracks look like the wood dried out so filling with epoxy would be best as I doubt you can clamp them.
The one that goes up the side looks like it was already glued, or it's been partially filled by a finish or oil.
 
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