Best Metal Epoxy of 2026

Fifteen to 24 hours is a long time to leave a repair clamped and untouched, and that is the deal J-B Weld Original asks for. What the wait buys is the highest service temperature on this page, 550°F, plus a steel-reinforced cure with a stated tensile strength of 3,960 psi — which is why this is the tube we keep in the shop for brackets, castings, and anything that lives near an engine. Mix it after dinner and the part is back in service the next evening.

Both parts come in separate metal tubes rather than a syringe, and we came to prefer that for metal work. Squeeze two equal ribbons onto a scrap of cardboard and mix them with a stick: the 1:1 ratio stays honest, nothing sits hardening in a shared nozzle, and the rest of the tube is still usable next month. The tubes are stiff, so measure the ribbons side by side instead of free-pouring and hoping.

On bare, freshly abraded steel it behaves like the cold weld it is named for, and once cured you can drill it, tap it, sand it, and paint it, so a filled hole can take a screw afterward. The 4-to-6-hour set window leaves room to clamp and align without panic. What it will not do is rebuild missing material: a 2-ounce kit is for joints and cracks, and a casting with a corner snapped off wants the paste or the putty stick below.

A leaking pipe joint, an overhead bracket, a rusted-through patch on a mower deck: these are the repairs where a liquid epoxy runs out of the joint before it has a chance to set. J-B Weld SteelStik sidesteps that entirely. It is a two-part putty in stick form, and you cut off a slice, knead it in your fingers until the color is even, then press it into place, where it stays.

Kneading is the whole skill, and it is a forgiving one. We like that you can feel the stick turn from crumbly to uniform under your fingers, and that the timing is honest: five minutes to set, an hour to cure, fast enough to sand and paint the same afternoon. Once cured it is steel reinforced at a stated 4,000 psi and rated to 350°F continuously, 450°F intermittently.

Where it beats a syringe is anything that cannot be clamped or that is missing material — rebuilding a stripped hole, filleting the base of a joint, filling a gouge before paint. It is also the one to hand someone who has never mixed epoxy, because there is no ratio to get wrong and no dispenser to clog. For a tight hairline fracture in a casting, though, a thin epoxy wicks in where putty cannot reach.

A pound of paste in two cans is a different proposition from a 2-ounce syringe, and PC-7 is what we reach for when the job needs volume: a rotted window sill, a gouge in masonry, a chipped step, a hole where a fitting pulled out. It is thick enough to trowel into a vertical gap and stay there, and the high wet grab keeps it from sliding out of an overhead fill while it sets.

The working time is the other half of the appeal. PC-7 stays workable long enough to mix a batch, fill, and then fuss with the shape, and it is rated for application on surfaces from 35°F to 115°F, which matters if you are patching outdoor masonry in November rather than in a heated shop. Full cure takes 48 hours, so plan on leaving it alone for a couple of days before you sand or paint.

What it gives up is outright tensile strength: at 2,150 psi it has the lowest stated figure among the picks here that publish one. For a filler that is the right trade, because you are replacing missing material rather than holding two clean faces under load, and the paste bonds fiberglass, wood, concrete, brick, glass, ceramic, and metal, so it turns up in more places than a metal-only epoxy. It also seals leaks in tanks and plumbing, which is a job no thin syringe does well.

One tub covers a long list of patching jobs, and two cans with no dispenser means nothing clogs between sessions — you mix every batch by hand with a stick. That suits someone working through a punch list over a season rather than bonding one bracket. For two prepared metal faces and nothing else, a steel-reinforced epoxy does it with a fraction of the material and a much shorter cure.

No clamping is the claim that makes Permatex's four-minute epoxy useful. Plenty of repairs give you nowhere to put a clamp — a knob on a shaft, a fitting inside a housing, a bracket still bolted to the machine — and a fast-setting, gap-filling epoxy that holds its own position solves a real problem there.

Four minutes is quick enough that everything gets laid out before we mix: parts, a stir stick, and something to wipe the tube with. What we did not expect at this size is the strength. At 4,500 psi it carries the second-highest stated figure in this group, ahead of our top pick, and the cured bead can be drilled, sanded, filed, and threaded. The range runs from -60°F to 300°F, so it is as comfortable on a snowblower part as under a hood.

The metals list is unusually broad — aluminum, brass, chrome, copper, iron, stainless, and steel — and the epoxy fills gaps without shrinking, so it grips a pitted or uneven face instead of skating across it. Stainless is the surface to treat with the most care: degrease and abrade it before you mix, because the cured epoxy is unforgiving of a surface that was not clean.

Rebuilding a worn bracket or a gouged casting is a different job from gluing two flat faces together, and it needs an epoxy you can still move after you have applied it. AOJEL S300 gives you up to 30 minutes of working time at 77°F before it starts to go — enough to fill, build past the edge of the damage, align, and clamp without working against a clock.

The syringe is the usual 1:1 dual barrel, but the sequence that comes with it is unusually specific: purge until both parts flow evenly, discard the first bit, mix, build, align, clamp, cure. We appreciated the purge step, because the first push from a fresh syringe never comes out even, and an unbalanced first squeeze is a bad start to a job that only gets one attempt.

After full cure it is waterproof, oil resistant, and rated to 392°F — second only to J-B Weld Original here — and it can be drilled, sanded, filed, and painted, so a rebuilt edge can be shaped back to a working profile. Aluminum and cast aluminum are named alongside steel, stainless, and cast iron, so the cast housings and pot-metal parts that other epoxies only half-address are squarely in scope.

Fifty milliliters goes further than it sounds when you are spreading a thin film and much less far when you are building up a lump to reshape. The repairs that justify it are the ones that would otherwise mean a new part: a housing, a mount, a bracket with a broken ear. For two clean faces and a five-minute job, a cheaper syringe does the same work.

Clear is the whole reason to reach for this one. A chip on a painted metal door, a hinge pin inside a cabinet, a handle you want to look untouched — a clear cure does not announce itself, and Gorilla's syringe is what we keep for those jobs. At a stated 3,300 psi it sits a step below the steel-reinforced picks here, so treat it as a household repair rather than a structural one.

The dual syringe dispenses both parts together, which keeps the 1:1 ratio honest, and the cap lets you put it away between repairs instead of using the whole thing at once. Five minutes to set is quick enough to hold a small part by hand; the 24-hour full cure is the number to remember before you put any load on it. It is also thick enough to bridge a small gap and to stay put on a vertical face, which a thin clear epoxy usually will not.

Smooth, shiny metal is where it can disappoint — it bonds well to a scuffed surface and can let go of a polished or oily one, so degrease and abrade before you mix. We also keep it for mixed-material jobs where the clear cure and the five-minute set do most of the work, like a glass knob back onto a metal stem.

4,680 psi is the highest tensile figure claimed by anything on this page, and it comes on a syringe from a brand most people will not recognize. Take the number as a claim rather than a promise — what decides a repair like this is how clean the metal is and whether the 1:1 ratio came out even.

The dual syringe is meant to handle that ratio for you, and when it flows evenly it does. The epoxy comes out thick enough to stay where you put it on a vertical face, and you get 30 minutes of working time before it starts to set, with a full cure at 24 hours. For a bracket, a mower deck, a trailer fender, or a battery tray, that is a comfortable window to line things up and clamp.

This is the budget pick here for metal repair, and what we noticed is that the extra working time, not the headline number, is what makes it useful. Know what it is not for: the maker's list of surfaces it will not bond to is longer than most, and it is worth reading against your part before you buy, because no amount of prep fixes the wrong substrate.

The kit includes gloves, sandpaper, and a scraper, which tells you what kind of product this is: a putty you shape, sand, and paint rather than a syringe you squeeze into a joint. The white color is the practical part — on a chipped enamel sink, a patched panel, or a fiberglass shell, a light filler takes primer and paint without a dark shadow showing through.

Working it is straightforward. Cut equal parts with the spatula, knead until the color is uniform, and press it in. We found the gloves earn their place, because the putty is sticky on bare hands, and it holds its shape once applied, which is what you want on a vertical patch or a corner that needs building back up.

Given the full 24 hours it cures hard enough to sand, drill, tap, and paint, with resistance to water, oil, and corrosion. That combination is why it suits plumbing patches and pool-side repairs as well as cosmetic fills — the cured putty is meant to be shaped, not just stuck.

A 400-gram tub is a lot of putty, and that is the point: this is one to buy when you have a list of patching jobs rather than a single repair. It is at its best on holes, cracks, and missing corners that need to look right afterward, and there is enough in the tub to redo a first attempt without rationing.