H-455 Alumfast 6.5 oz Rapid Cure Aluminum Putty Repair Kit

I bought this because one of its specified uses is to repair aluminum castings. I used it to repair a cast aluminum differential case on a self propelled concrete saw. It had been backed into something sticking out of the slab and broke a hole the size of a lemon in the casting. I used this product to affix a custom bent piece of 1/8" aluminum plate over the hole and it has been several months now and it doesn't leak a drop of gear oil. Calling it putty is a bit of a stretch as it is too thin for that name. It does set up fast though so you can wait for it to thicken a little.

I think chiming in with my $.02 might possibly be of service to any of y'all out there with a similar or identical very niche usage case for this epoxy like I did when I was shopping around for bonding agents to fix a minor, yet debilitating botching of an 80% AR lower completion attempt. In my case I somehow stupided up what I consider the most demoralizing part, which is the last steps (if you so choose it to be, of course) of drilling the trigger pin holes, which negated the entirety of my anticipated satisfaction of an otherwise pristine milling job in the hands of a novice.... SO, after scouring the internet for advice for what my options could be & finding them to be very limited due to the nature of the common 7076 aluminum alloy AR lower receivers are usually made from; I first attempted the tried-and-true, all-'MURICAN ultra-resilient/permanent gadget-resurrector of JB Weld & unilaterally failing at even creating a glimpse of hope or progress despite my determined spirit which led me to attempt every possible tweak of application & curing methodology with each attempt's surface preparation technique zealousness-level cranked up buy about an order of magnitude each go-around. Every attempt produced the same results of "play-dohing out" whenever I attempted to redrill the trigger pin holes with the hope and expectation that the minuscule amount of the epoxy that I required to fill in my mistake would remain rigid and firmly anchored with a nice, clean, smoothly finished surface after being drilled through. It probably works hella well on a different substrate for drilling, but it just sucks for this application (as in fails miserably.) NOT THIS PRODUCT THOUGH! THIS IS THE ANSWER!!! YAYYYYY! For real, while JB weld still retains strength when bonding to 7076 alloys, it's "toughness" is nil (on that note: in my opinion, it generally lacks that attribute of "toughness" in the formal/technical definition to the degree that I would rather see the j-b weld company just drop the suggestion that it's a drill-friendly bonding agent since they apparently view the underwhelming merit of it not *completely* crumbling away when a drill bit gets intimate with it in the same way someone viewing a ramshackle house that had just withstood a category 5 hurricane as an impervious fortress when it's actually totally compromised in every possible way structurally...), whereas even though i am clueless as to to the shear & compression strengths of this expoxy, it is *extremely* tenacious and TOUGH. Nice, clean smooth trigger pin holes, in the right place now, too! Pricey, true but if you don't have a legit method worked out already for fixing the stupid you imparted into your AR build, consider that whatever else you attempt instead of this, without having a 100% certainty of success will likely just make you waste more money before listening to someone's proper testimonial, and I'm not the only one in this review section either!

So i will say this, i tried to use it on a cast aluminum block on a honda. It bonded great to the crack. But we had a hair line crack on an oil channel that supplied oil to the oil pressure sender. It held well but the oil was seeping thru the crack at the threads. If you fixing chips,broken flange or bonding two pieces, this is the stuff.

very good

It is still just epoxy. It is Ok for its purpose (fixing HVAC stuff) but I was hopping for higher Al content so it can actually look like Al. It looks gray (darkish) but not the same gray. So if the looks is something important this is may or may not work for you depending on what oxide your Al piece has. It did not work for me so I paid for the privilege of finding out.

I used it to fix a pinhole in my High ac line and I used it to fix that. It’s been a week and so far it has held up. I let it set for a week. Easy to use.

Love this stuff. I got a set of polished aluminum valve covers from the other side of the globe and they had a couple of small voids from the casting. I was able to mix this epoxy on a plate and put it into a pharmacy style syringe for kid’s medicine…and it worked perfectly.

It’s may be a step up from Super Bowl. It doesn’t really believe anything together.