Bondo metal reinforced filler

Something to keep in mind about bedding material is often it needs to be altered... and the really hard materials are really hard to remove... and there is no accuracy benefit to really hard bedding materials compared to the 'normal' bedding materials that have been proven and used for 50 years... for instance "Brownells" offer a product (Acraglas) made for them (designed for the gun trade) that is easy to use and easy to remove, workable with normal inletting tools. I first used in the the 60's right up until I retired this year.
 
The biggest mistake most uneducated DYIs make when applying bedding materials that are harder or less viscous than Acraglass or even regular fiberglass kits from Canadian Tire, which work well, is that they apply to much for the job at hand.

They also don't take the necessary precautions to stop the flow of materials.

The other issue, especially with materials such as metal based composite types is that they don't flow and have to be "pressed'' into place. This can be a real boondoggle if you don't have the equipment to remove this screw up.

Unless you've got some experience with bedding, take guntech's advice, gained from years of experience, stick with tried and true materials.

guntech used the methods/materials that worked well for him and allowed him to make some money on the job. You don't get paid for crappy bedding jobs.

Depending on the firearm, especially one that has questionable original inletting, such as those very cheap European bolt rifles being offered by several outlets, such as Intersurplus and Lever Arms to name a few, most of the commercial types don't have cross bolt bedding blocks. They need to be properly bedded. Often, I do a preliminary bedding job, to see if it will actually help. Then take it all out and do a proper job.
 
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any "bondo" product once catalyzed would not give much work time before it went off, i would use jb weld long before automotive filler.
 
'Bondo' class fillers by design have some flex/give to them - and unfortunately do not perform well as bedding material.
 
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