J-B Weld High Heat Epoxy Syringe, Dark Grey

Worked well for my application. Needed a solution to cover up oem exhaust baffles for a 2021 Chevy Trailboss. This was easy to mix and apply with a small boars bristle brush. Went on at the right consistency and seems to be holding up well.

This stuff is awesome. I recently discovered J-B Weld. I'm a 60 ish year old woman who knows just enough to be dangerous when it comes to diy repairs. I used it to seal a crack in my concrete furnace pad. I taped off the concrete surrounding the crack and used a throw away sponge brush to fill the crack and smooth out. I then removed the tape and it looks like a professional job. Was quite pleased. Wish I would have known about this product sooner. Also, mixing the product is extremely easy with the provided plungers that squirt the exact amounts of liquids simultaneously.

This has worked beautifully on the ceramic plate on the front of my wood stove. It gets pretty darn hot and so far no sign of it failing. Try it!

This is a Must Have for any Mechanical minded Person who Yes Broke something taking it apart because of plastic dried out and Just broke! Oops crap happens sometimes be Ready. I bought this to repair a flashlight LED bulb glue broke loose He’s 3 and Paw Paw’s can’t fix it your Screwed! my grandson broke. It got Extremely HOT so high heat resistance was needed! This JB weld been around years! And yes have a tube of this in your tool box! The set up time verses replacement and shipping of an item. Well this stuff saves the day.

I used this J-B Weld High Heat Epoxy Syringe to patch a small hole in the brick surround of my wood fireplace, and it got the job done well enough. The syringe design is handy—two-part epoxy (resin and hardener) mixes right as you push it out, so no messy stirring. I had a pea-sized hole from a chipped brick, and the dark grey color blended decently with the soot-stained area, though it’s not an exact match to fresh brick. Application was simple: cleaned the spot, squeezed out a dab, smoothed it with a putty knife, and let it cure. It’s rated for 500°F continuous (600°F short-term), which fits my fireplace temps—usually around 400°F near the surround. After a week of daily fires, the patch is holding strong—no cracks or crumbling, and it feels rock-solid. The 0.7 oz size was plenty for my small fix, with some left over. It’s not perfect, though. The cure time took the full 24 hours to feel fully hard (set in about an hour), so patience is key. Also, it’s a bit thick to work with—great for filling, less so for super-fine cracks. Compared to a basic heat-resistant caulk I’ve tried, this epoxy feels tougher and more permanent, though it’s overkill for non-structural stuff. For high-heat repairs like fireplace patches, it’s a reliable pick. I’d give it 4 stars—works as promised, but the thickness and cure time temper the ‘wow’ factor. Good for small, durable fixes!

I'm really impressed with the J-B Weld High Heat Epoxy Syringe. Fixing cracks can be a hassle, especially when you need something to hold up to high heat. This epoxy syringe made the whole process so much easier. The One-Step Syringe is a Game Changer - Forget messy mixing and imprecise measuring! The one-step syringe design is genius. Just dispense equal parts of the epoxy from the dual plungers and you're good to go. No mess, no fuss, and no chance of messing up the ratio. The epoxy sets up in about an hour at room temperature, and cures completely in 24 hours. That's plenty fast for most repairs. But the real winner here is the heat resistance. I used it to fix a crack in my chiminea, and it's held up perfectly through the first few fires. I'll definitely update this review after I've used the chiminea for a longer period, but so far, I'm very happy with the J-B Weld High Heat Epoxy Syringe. It's easy to use, bonds like crazy, and can take the heat. Highly recommend!

this stuff alwaysworks great...

Wow. Just wow. I used this stuff to glue a handle back on to my fireplace door after replacing the glass panel that had shattered. The handle only has two small posts that connect it to the metal door frame, and I was uncertain whether there was enough surface area for the glue to hold. After applying the glue to the handle I let it set up for 24 hours, and MIRACLE - it is holding strong and tight! This stuff works. A great product that solved a difficult problem, I am very happy that I bought this.

Producto funcional. Cumple con sus especificaciones. Lo use para pegar una tuerca que fija la bobina a la tapa de punterías y pego muy bien entre metal y plastico.

Very good product, thank you. It is heat resistant, as stated. I used it to stick a knob back onto an airfryer and it has worked really well.

Dessertcart just playing around with the delivery date!

Does what it says. I am from India and probably this is the first review from Indian Standpoint. I broke my engine oil pit hitting a rocky bottom on the road, which made a dent in the sump. After researching much I found out this solution to fix break for temperatures outside normal epoxy range and to my wonders this works great. I sanded the surface as described, cleaned it with rubbing alcohol and pasted a mix of the solution. It looks rock solid and theres no leak as well.

Very good product