Release agent for glass bedding??

[sable tireur]

Just like virtually every other process involving firearms, bedding with pillars will have a dozen or more variations as to how the bedding is done. Here is one of the best articles regarding bedding handled by one of the acknowledged masters of bedding:

https://www.6mmbr.com/pillarbedding.html

Read carefully
Follow the order, in order
Do a dry run with each part of the process so you have all the parts laid out
Get organized
Get started!

 

[ntsqd]

Yep, read that. His process didn't exactly fit this rifle's situation so I adjusted it.

FWIW I disagree with the choice of the Devcon Steel Putty. All you have to do is compare the specs to both their Ti Putty and their Aluminum Putty to see that the AL Putty is the better choice and that the Ti Putty is by far the worst choice.

 

[Edd]

Yep, read that. His process didn't exactly fit this rifle's situation so I adjusted it.

FWIW I disagree with the choice of the Devcon Steel Putty. All you have to do is compare the specs to both their Ti Putty and their Aluminum Putty to see that the AL Putty is the better choice and that the Ti Putty is by far the worst choice.

What specs did you use to determine that?

 

[ntsqd]

Those published by Devcon themselves. I compared shrinkage, compressive strength, and coefficient of thermal expansion as those were what I thought would be most relevant to this use. I really expected the steel to be better than AL in thermal expansion, and it isn't. I was also surprised by AL having a very slightly higher compressive strength. AL does give up a tiny bit to Steel on shrinkage, but for the tiny .0002in/in difference I'll take the AL's advantages in the other pertinent specs. Toss in that it's lighter than the Steel Putty and it seems like the clear winner to me.

AL Putty:
https://itwperformancepolymers.com/media/1014/aluminum-putty-f_041418.pdf

Steel Putty:
https://itwperformancepolymers.com/media/12748/plastic-steel-putty-a_062919.pdf

Ti Putty:
https://itwperformancepolymers.com/media/1066/titanium-putty_041418.pdf

 

[Edd]

Why do you think Titanium is by far the worst choice?

 

[Dean2]

Why do you think Titanium is by far the worst choice?

Most expensive by far, most shrinkage, about he same thermal expansion. The only place, and all of this is by memory, that the TI is better is compression resistance.

 

[aushunter1]

Kiwi does the trick

Yep Kiwi clear shoe polish does the job well & its only like $4 a tin that will do like 50 rifles!

 

[ntsqd]

Why do you think Titanium is by far the worst choice?

These were the performance criteria that I selected as important to this application, arranged by the priority I gave each, highest to lowest. Others may choose differently or weight these differently.
When you factor in the cost of it, Ti becomes the worst choice. Can get a much better benefit/cost from either AL or Steel. If AL's shrinkage were a little less it would be the decisive winner. As it is I think it is still the best choice.

Property Aluminum Putty Steel Putty Titanium Putty

Coef. Thermal Expansion { [(in.)/(in). x °F)] x 10(-6)} 29 48 22
Compressive Strength {psi} 8,420 8260 15,200
Cured Shrinkage { in./in. } 0 .0008 0.0006 0.0010
Adhesive Tensile Shear {psi} 2,600 2800 2,000
Specific Gravity {gm/cc } 1.58 2.33 2.36
Cured Hardness {Shore Scale D (?)} 85 85 87



It's too bad the html screws with the table formatting.

 

[Braunschweiger]

johnsons paste wax. it's $7 for a tub that wouldnt go through in 10 lifetimes. i've used it for all sorts of stuff. apply it with a brush and then clean it off with brake cleaner. it's so cheap that there's no reason not to liberally apply it.

https://www.lowes.com/pd/Johnson-Johnson-16-oz-Floor-Polish/3384826

I 2nd this.... it's cheap, readily available and you'll never use it all...

 

[Rprecision]

Kiwi clear, I have had my best results with Devon steel epoxy. Never tried any of the other varieties.

Degrease it well! Polish on a few thin coats. I add a little extra in critical spots, then get messy