I need the best or second best (NASA level) "EPOXY" for a project. It can't shrink.

[Sourdough]

Needs to cure hard. And no shrinkage.

 

[Pearl]

NASA approves Master Bond Supreme 10HT! I googled that just now, you might Google it too and check it out!!

 

[randyt]

I like JB weld

 

[SoJer]

Needs to cure hard. And no shrinkage.

a) What are you Bonding? (just the Materials - don't need to 'break OPSEC' about yer Project.. asking, as..

b) Depending on the Materials to-be Bonded.. the "Best Non-Shrinking NASA-Level Bond" will be via one of the 'UV-Cure Epoxy's..

I used to use some of that stuff for building Optical sub-assemblies (in a 'Clean Room', under a stereo-microscope) for Laser-systems, where the Parts had to not only 'last' - thru Impact / Vibration / Heat/Cold - whatever - but to NOT 'shrink', down to tolerances of keeping a Laser-diode's beam focused in a particular-point thru a Crystal - to a couple "nm"s (that's Nano-meters And That stuff Did it. Yah, it's 'NASA-grade' alright..

..That's Also a reason it's the Top Choice for restorative Dental work - Keeping Porcelain / Zirconium, etc Crowns / Veneers, etc, in-place - thru heat / cold / Extreme Pressure from biting / chewing, etc... impacts from Errant Forks etc.. - and For Years, so..

Let me know more about yer 'Materials to Bond', and I'll check my sources / see if there's a Good match..

PS - Good 'Pro-grade Adhesives' resource for some Research: https://www.gluespec.com/

jd

 

[Sourdough]

What are you Bonding?

Filling a "plastic" firearms buttstock that I cut in half.

 

[SoJer]

Filling a "plastic" firearms buttstock that I cut in half.

Ah, well in That case, I would also second 'JB Weld' (the 'regular / classic' 2 part, Not the 'Steel Weld'..) It's 'low-shrink Enough', I believe for This application, anyway, and Definitely 'tough enough' for it.. ie:

..Recall my 'Brake Job'? - https://www.homesteadingforum.org/t...hat-was-gun-related.5407/page-105#post-642147 ..Well, turned out I just could NOT get the 'silver solder' to take to Re-solder the Front Sight, there - Apparently, the barrel (though Plenty 'cherry red Hot'..) was acting like a 'heat-sink' / just Not letting the solder 'take' properly (Im betting the Factory puts the Whole dang Barrel in like a coke-oven or something, when they Initially solder those on, it was a Biotch to get off.. ) so..

..I gave up on that approach, and just tacked the sight on / 'potted it' between the side-clamp 'teeth' with JB Weld... And it's been Rock Solid, since (yes, Including surviving the 'shock & heat' of shooting that puppy round after round after...

So, yah, I'd bet on JB Weld for yer Stock-job, Cap'n.

Fwiw..
jd

 

[Sourdough]

Then JB Weld it shall be. Thank You.

 

[SoJer]

Then JB Weld it shall be. Thank You.

Aye, just be Sure to clean the surfaces / bond-edges Really Good of any finger-oil / grease / dust, etc.. I will usually use Acetone, which - depending on the type of Plastic (and I'd Bet pretty much Any gun stock can 'survive it'..) - will give the surfaces to be bonded some 'tooth'.. JB Weld likes 'tooth'.

Actually - Maybe scratch that.. I just now 'fully absorbed' Post #5 - "Filling" - as-in, "filling" a Large cavity / hollow? How Big is the 'pocket' in the part that's left over? More than half an Inch wide / deep? If so, well..

In That case, I'd propose 'Gasket Maker' Black RTV, then.. Readily avail. at just about any Auto Parts store ('Auto Zone' / O'Reilly's / NAPA, etc) I've Also used that to Quite good success on my 'Wood-Forestock Mod-Job' for the Henry X, as a 'gap filler', ie:

..Final result: Every-bit as Tough as the 'OEM poly-forestock', there, and No Problemo with the 'heat' from the barrel when shooting, etc (Remember: 'Gasket Maker' RTV is Designed to go onto / into Engine Blocks, so.. Yah, it's also Tough Enough, and should Not 'shrink' much, if at all..

.02
jd

 

[Sourdough]

The H&R (very limited edition) 300 AAC BLACKOUT now has an 8" LOP and 26.5" OAL. It will be utilized/fired much like an ENCORE handgun. But it remains a legal rifle.

 

[SoJer]

@Sourdough Bump to see the 'Edits, above' re: JB Weld vs RTV..

jd

 

[Sourdough]

Actually, there is no need to even fill that void, other the appearance/looks.

 

[SoJer]

Actually, there is no need to even fill that void, other the appearance/looks.

Entry point for Dust / **** into buffer-spring seat? I'm just guessing, Obviously You know best, so.. At least ya Gots Options..

jd

 

[Sourdough]

https://www.thetruthaboutguns.com/gun-review-aac-hr-handi-rifle-300-blk/

 

[Sourdough]

I took 3.5" off the buttstock to get 26.5" OAL. So, if it looks short in the photo it is now goofy short.

 

[SoJer]

..if it looks short in the photo it is now goofy short.

That's OK, 'goofy short' can Still 'Get the Job Done'..

jd