Bedding can be as easy or as difficult as a person wants to make it. Nothing wrong with using JB Weld to bed your gun, however you'd be a wise man to rethink your choice of release agent(s).
The whole idea behind bedding is to make a tension free register for the barreled action to reside in. It should be inert to ambient weather and have a high tolerance to chemical exposure, like acids and alkalies. The resin system should have a low shrinkage, high shear, high compression, and high shore hardness.
That's it. Very simple in thought, a little more complicated in practice/application.
Use a commercial mold release agent. They are available in aerosol form and are very affordable, usually under ten bucks a can.
Results can vary but here's what mine look like:
