Description
Review this item in the context of the repair, installation access, nearby parts, and the result the completed job is intended to achieve.
Rapid cure aluminum putty repair kit. A two component epoxy formula highly concentrated with carefully selected pure aluminum particles, modified curing agents and high quality additives to provide maximum strength, durability and ease of application. Alumfast is specially formulated for HVAC copper pipes, HVAC condenser coils, tanks, valves, pumps, castings, water jackets, radiators, etc., where a fast and strong, non rusting aluminum repair is desired and where there is not constant exposure to water. After it cures, Alumfast can be machined, sanded, drilled and tapped which makes it a popular choice for automotive, plumbing and HVAC repairs.
No structured vehicle fitment data is available. Compare the listing with the vehicle and existing part before ordering.
Repair scenarios, installation, companion parts, and use outcomes
Buying guidance
Quick decision
Review this putty in the context of the repair and the surrounding components.
Repair scenario
- Identify the symptom and confirm that this is the component required by the repair.
- Inspect nearby connectors, fasteners, and mating surfaces before installation.
Installation notes
- Use the listing instructions when present and follow the vehicle service procedure.
- Professional installation may be appropriate when the repair requires special tools or calibration.
Companion parts
- Inspect nearby fasteners, connectors, seals, fluids, and wear items before starting the repair.
- Use the service procedure and the visible package contents to identify any additional parts or tools required.
Before you buy
- Compare the listing title, photos, package contents, and specifications with the part being replaced.
- Confirm vehicle compatibility and installation requirements before ordering.
Customer feedback
Ratings and written reviews
4.3 / 5
329 source ratings
Source: Amazon. Imported marketplace feedback is shown for product research and is not a review of a purchase made on this website.
Doru Nica –
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.
KurTX –
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!
Antonietta W –
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.
Harold Burris –
Description states color is white, it is gray.Was wanting to patch tiny holes in white swimming pool aluminium coping.
kris –
After trying a few different options for repairing a hole in a transfer case I came across this product. Initially it seemed cheap and like the rest until it started to cure where it really shined. This is my new go to aluminum repair. The adhesion was awesome and has saved me a lot of work after discovering a hole in my transfer case due to a failed training mount causing part of a shield to rub through.
Héctor –
Context: I have a 1990 yamaha bigbear ATV which had seen better days. It started smoking like crazy so the time came to change pistons and combustion chamber. In the process, stuck bolts and a very stubborn stator made me mistakingly impact the engine case with a hammer. I could see a crackline and one of the bolt holes was partially destroyed. I saw the reviews and I got this with high expectations as the case is aluminum I figured this one would be more compatible. I used it to repair a couple of hairline cracks on a middle drive gear case as well and so far it hasn’t disappointed. It’s been two weeks of intermitent use but so far it is holding up well and I’ll make sure to update this if anything comes up.
Mark B. –
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.
Jesse w –
This product fixed the crack in my aluminum transfer case no leaks, have tried others. This is the only one that actually works.