What is the best heat resistant glue?

When needing to make or repair something that is often exposed to extreme heat, it’s important to have the peace of mind that the glue you use for it with be able to withstand that heat. Whether it be for fireplaces, industrial equipment, or even just the interior of a car on a hot day, you glue needs to hold strong. Here are the best heat-resistant glues.

Table of Contents

Bestseller No. 1
J-B Weld High Heat Epoxy Syringe, Dark Grey
  • J-B Weld HighHeat is a two-part epoxy system that provides strong, lasting, heat-resistant repairs up to 550°F. Mixed at a ratio of 1:1, it forms a permanent bond that has a 4730 PSI strength and is chemical and fuel resistant. At room temperature, HighHeat sets in 1 hour and cures in 24 hours. HighHeat's cure time is accelerated by heat and can cure in 1 hour at 250°F.
Bestseller No. 2
J-B Weld 37901 ExtremeHeat High Temperature Resistant Metallic Paste - 3 oz
  • Jb Weld Extreme Heat: Is Formulated For Repairs To Iron, Steel And Metal In High Temperature Environments 1000°F / 537°C. Non-Flammable, It Contains No Solvents Or Volatile Organic Compounds (Vocs).
  • The Original Cold Weld: Jb Weld Was Developed As An Alternative To Torch Welding. Designed To Be Effective In Extreme Environments, Once It Sets, It Creates A Permanent Bond Stronger Than Steel.
  • Simple To Use: When Fully Cured, This Metallic Compound Can Be Drilled, Machined Or Sanded. It Is Great For Repairing Cracks, Small Gaps, Seam Connections Or Holes.
  • Versatile & Dependable: Ideal For Repair Work On : Exhaust Manifolds, Pipe Connections, Mufflers, Catalytic Converters, Outdoor Grills, Fire Boxes, Gas And Commercial Furnaces And Water Heaters.
Bestseller No. 3
Surebonder Large Silicone Mat with Ruler for Hot Glue Gun Projects, Flexible & Heat Resistant Surface for Easy Cleanup Or Use for Tracing Projects, Size: 19" x 19" (6201)
  • PROTECTS YOUR WORKSTATION FROM GLUE DRIPPINGS - At 2 millimeters of thickness, this oversize sized mat lightly grips your work surface to protect it from excess or accidental glue discharge as you use your glue gun.
  • 16 INCH RULER DISPLAY - A 16-inch ruler is embossed on the bottom right side for accurate measurement and convenience.
  • PEEL OFF DRIED GLUE WITH EASE - The non-stick, heat-resistant surface allows you to easily peel off dried glue for recycling or use the pad for tracing projects.
  • EASY CLEANUP - The ability to peel off the excess hot glue makes cleaning up after a project a breeze.
  • BRIGHT GREEN - The neon green color of the glue mat makes glue drips easily visible, so there is no need to double-check!
Bestseller No. 4
J-B Weld Superglue Gel 15g 2 Pack - SuperWeld Extreme Gel
  • J-B Weld SuperWeld Extreme: is a super glue gel that is specially-formulated to provide a flexible,impact-resistant bond in seconds.
  • High-Strength: SuperWeld Extreme Gel has a tensile strength rating of 3000 PSI!
  • Set Time: Product fully sets in 30 seconds!
  • Surfaces: MOST PLASTICS, Rubber, Leather, Metals, Stone, Concrete, Wood and more!
Bestseller No. 5
Aron Alpha Industrial Krazy Glue-AA900 Aron Alpha 414TXZ (6,000 cps) High Heat (250 F) and Impact Resistant Instant Adhesive 50 g (1.76 oz) Bottle,clear
  • Fast curing, ethyl-2 cyanoacrylate instant adhesive; Designed for applications requiring high heat resistance, high peeling resistance, high impact resistance and thermal shock resistance
  • No run gel viscosity (6, 000 cps) for gap filling up to 0. 008 inches
  • Fixture time within 3 seconds on rigid PVC; 5 seconds on Neoprene; 10 seconds on Steel and 30 seconds on Aluminum; Full cure 24 hours
  • Shear strength (PSI) on rigid PVC, : 3,600, Steel: 4,300; Impact resistance bonding steel to steel is 7 ft-lbs per square inch; Heat resistance bonding steel to steel after exposure 248 F x 24 hours is 1,700 PSI
  • Designed for metal and rubber surfaces and can withstand extreme hot and cold temperatures
The best heat-resistant glue is J-B Weld ExtremeHeat High Temperature Resistant Metallic Paste. Compatible with metals like iron and steel, J-B Weld ExtremeHeat High Temperature Resistant Metallic Paste can withstand temperatures upwards of 1000°F / 537°C and is so strong that it can be a replacement for torch welding. J-B Weld ExtremeHeat High Temperature Resistant Metallic Paste can be used in both professional and home applications and is perfect for things such as outdoor grills, water heaters, pipe connections, mufflers, exhaust manifolds, catalytic converters, fire boxes, and gas and commercial furnaces.

Best Heat-Resistant Silicone Glue

The best heat-resistant silicone glue is Rutland 500°RTV High Heat Silicone Sealant. Perfect for sealing fireplace inserts, Rutland 500°RTV High Heat Silicone Sealant can adhere to just about any material, including but not limited to brick, metal, glass, fiberglass, aluminum, plastics, wood, and stone. Rutland 500°RTV High Heat Silicone Sealant can also be used for repairing solar panels and heat sealing behind stoves and can withstand temperatures upwards of 500° F/260° C.

How to Use Heat-Resistant Glue

Best Heat-Resistant Glue for Plastic

The best heat-resistant glue for plastic is Loctite Stik n’ Seal Extreme Conditions Adhesive. Loctite Stik n’ Seal Extreme Conditions Adhesive is resistant to more than just extreme heat, but also extreme cold and moisture as well. It can even be applied onto wet surfaces and still hold just as strong. And while Loctite Stik n’ Seal Extreme Conditions Adhesive is a great heat resistant adhesive for plastic, it also works well on leather, glass, mirror, fabric, ceramic, wood, stone, concrete, and metal-to-porous surfaces.

Best Heat-Resistant Glue for Outdoors

The best heat-resistant glue for outdoors is Permatex High-Temp Red RTV Silicone Gasket. Permatex High-Temp Red RTV Silicone Gasket is resistant to extreme conditions both indoors and out and has a temperature resistance range of -65°F to 650°F. The suggested applications for Permatex High-Temp Red RTV Silicone Gasket are oil pans, timing covers, valve covers, thermostat housings, water pumps, and transmission pans.
The best heat-resistant glue is J-B Weld ExtremeHeat High Temperature Resistant Metallic Paste. The best heat-resistant silicone glue is Rutland 500°RTV High Heat Silicone Sealant. The best heat-resistant glue for plastic is Loctite Stik n’ Seal Extreme Conditions Adhesive. And the best heat-resistant glue for outdoors is Permatex High-Temp Red RTV Silicone Gasket.
There are some that are, yes. But not every heat-resistant glue is also totally waterproof as well, so make sure you check your glue.
No, J-B Weld ExtremeHeat High Temperature Resistant Metallic Paste cannot be used to repair a stove burner grate. The heat is not the issue, but rather that this adhesive cannot offer enough structural support.
No, Rutland 500°RTV High Heat Silicone Sealant is not food-safe and should not be used anywhere that will come into direct contact with food.
For consistent exposure, Loctite Stik n’ Seal Extreme Conditions Adhesive can withstand a temperature range of -56F° to 176F° and for brief temperature exposure it can withstand a temperature range of -56°F to 248°F.
Yes, Permatex High-Temp Red RTV Silicone Gasket works great for repairing exhaust pipes.

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