J-B Weld High Heat Epoxy Syringe, Dark Grey

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!

Use to restore a solder tab on a relay. It does the job. Strong enough to withstand togs and pulls on the soldered tab and I mean soldered tab!

JB Weld has been my saver for all my Oopsies, works mint but do remember must use in a warmer climate. If it’s cold out it takes a lot longer to cure and do remember let it settle! Do Not apply and expect it to cure right away. I used this to hold crack manifolds to heating codes.

This item works well, is easy to apply, and holds up well in high temps.I used this on a broken car radiator, and it held VERY well!

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 used this to glue together the lid of my Emile Henry clay Italian loaf bread pan. These pans are expensive and pretty fragile. My glue job wasn't the neatest (I left some "squeeze-out" on the outer surface because I wanted to ensure a secure bond), but this was probably not necessary.I let the lid cure for about a week, and then I tested it out in a 450 degree F oven. I didn't notice any odors, and the bond held in the heat.

I used this to repair pin holes in a automotive radiator one year ago, so far so good.

very strong and lasting