I have bedded several of my rifles using JB's Weld mixed with household fiberglass insulation. Doesn't matter which whether pink or yellow. JB's will take up to 600 degrees of heat I believe and doesn't matter how cold it gets I don't think. So far over a period of 15 yrs. I have not had to re bed my first one. Will not sugar out. My first one is in a Ramline stock which I do not think is a very good stock but it has held together OK over those yrs. Some bedding material is like nailing jello to the wall. Mixing with the fiberglass makes it much more manageable. JB's costs about 6 bucks + or - and will do several rifles depending on your personal bedding practice. If a composition stock scratch up the surface to be bedded with a Dremel tool for good adhesion. Release agent is a must.
I use jb weld for a ton of stuff,my favorite glue now. am in the process of gluing a turkey beard and spurs to a shoelace to hang around the rear view mirror. it dries at a pretty fast rate which is good for most things but I think too fast to bed a stock. try west system epoxy, I believe it dries harder and I even use it on the outside of wood stocks, it strengthens/weatherproofs and can be buffed clear and an automotive topcoat put on it and buffed/polished matte to glossy.
"My first one is in a Ramline stock which I do not think is a very good stock but it has held together OK over those yrs."
Ramline stocks may not be very pretty but they are surely hell for stout. I have a Ruger tang safety chambered to the .375 Taylor wildcat. This is the .338 Win. mag. necked up to take .375" bullets and properly loaded will duplicate the famous .375 H&H magnum in a 30-06 length action. The whole package weight 7.5 pounds and hits like a hammer at both ends. The gun has never been glass bedded and so far has had maybe 500 rounds through it using a very stiff load of IMR4350. I have never had to do anything to that stock except put a better recoil pad to replace the one Ramline provided. That stock had held up just fine without any reinforcing glass bedding. it is a good thing you used some fiberglass material with the JB as it cab be brittle without the glass fibers. When I worked for a gunsmith in Nevada, I had to rebed several rifle where JB had been used without the reinforcement and it was a royal PITA getting that stuff out to redo the work. I'll stick to the Accraglass Gel for my glass bedding work. Paul B.
I agree with Paul, JBs can be brittle..There are so many good glass bedding compound out there that I see no reason to try to reinvent the wheel. Just my personal opinnion. Depending on what I am attempting to do with glass bedding I use either thin Accraglass for a paint coat or for strong bedding I use Marine Tex.
For those who don't do a lot of glass bedding Accraglass Gel is the easiest to use IMO.