The best two-part epoxy depends on the repair: choose a moldable putty for filling gaps or rebuilding metal, and a liquid epoxy for bonding surfaces with a clear finish. J-B Weld SteelStik is best for metal repairs that need a moldable, steel-reinforced filler. Boncart is better for versatile household repairs and sculpting, while Gorilla and J-B Weld ClearWeld suit quick-bonding jobs. The steel epoxy putty is another option for metal cracks, holes, and outdoor repairs.
| Product | Best For | Set Or Cure Detail |
|---|---|---|
| J-B Weld SteelStik | Moldable metal repairs | Sets in 5 minutes; cures in 1 hour |
| Gorilla 2 Part Epoxy | Clear household bonds | 5-minute set |
| Steel Epoxy Putty | Metal cracks and holes | Cure details not specified |
| Boncart AB Epoxy Putty | Multi-material repairs and sculpting | 24-hour full cure |
| J-B Weld ClearWeld | Clear, quick-setting bonds | 5-minute set; cures in 1 hour |
J-B Weld SteelStik For Metal Repairs
Best for: Metal repairs that call for a moldable filler that can be shaped after mixing. SteelStik is a hand-mixed, steel-reinforced epoxy putty that sets in five minutes and cures in one hour. The cured material is dark gray and can be sanded, drilled, tapped, and shaped.
Listed features include a 900 psi lap shear strength, resistance to petroleum and hydraulic fluids when fully cured, and continuous heat resistance up to 350°F. It is also described as non-rusting and NSF-certified for contact with potable water. These characteristics make it a practical choice for rebuilding or filling metal parts.
Limitation: Its dark-gray cured color may be visible on finished surfaces, and the five-minute set leaves limited time to position the putty.
Gorilla 2 Part Epoxy For Clear Bonds
Best for: Household or automotive repairs where a clear finish and gap-filling ability are useful. This two-part epoxy comes in a single applicator and sets in five minutes, allowing some time to reposition or adjust the bond before it sets. The formula can fill voids and bond uneven or vertical surfaces.
Choose this if you need a liquid epoxy rather than a putty that can be molded by hand. Its clear-drying finish can help keep a repair less noticeable, while its gap-filling feature is relevant when the joining surfaces are not perfectly even.
Limitation: The listed information does not provide a full cure time or specify which materials are compatible, so check the product directions for the repair at hand.
Steel Epoxy Putty For Heavy-Duty Repairs
Best for: Buyers seeking a putty specifically described for cracks, leaks, and holes in steel, iron, and other metal surfaces. The product is presented as a heavy-duty metal repair compound with a durable bond and resistance to impact, pressure, wear, heat, and water.
Its stated uses include household and industrial repairs, as well as pipes, tanks, and outdoor metal applications. Choose this if those listed repair conditions matter more than a clear finish or multi-material sculpting. The available details focus on metal repair and harsh environments rather than decorative bonding.
Limitation: The supplied product information does not state its set time, full cure time, temperature limit, or strength measurement. Confirm those details before planning a time-sensitive or high-load repair.
Boncart AB Putty For Multi-Material Jobs
Best for: Household repairs or sculpting projects that involve different materials. Boncart’s white, two-part epoxy putty is listed for metal, plastic, stone, wood, tile, ceramic, acrylic, and glass. It can be used to fill holes, cracks, breaks, and uneven surfaces, and the product description also mentions plumbing and pool leak repairs.
Mix equal parts of A and B, knead until the putty turns off-white, and apply it before it hardens. The working window is listed as up to 30 minutes, with a full cure after 24 hours. Its moldable consistency and stated resistance to shrinking or cracking make it suitable for shaping as well as filling.
Limitation: The instructions say not to use the putty underwater. Its longer full-cure time also makes it less suited to repairs that must be ready quickly.
J-B Weld ClearWeld For Quick Clear Bonds
Best for: Small bonding jobs where a clear finish, quick set, and measured mixing are priorities. ClearWeld is a two-part epoxy in a syringe designed to dispense a 1:1 mix. It sets in five minutes, cures in one hour, and dries clear.
The listed compatible surfaces include metal, tile, most plastics, ceramic, glass, and wood. Its stated tensile strength is 3,900 psi. A resealable cap is designed to help prevent drying and leaking between uses, and the package includes a mixing tray and stir stick.
Limitation: The five-minute set requires prompt placement after mixing. Because it is a liquid epoxy, choose a moldable putty instead when the repair needs material shaped into a hole or around an irregular form.
Buying Guide: How To Choose Two-Part Epoxy
Should you choose putty or liquid epoxy?
Use epoxy putty when you need to fill a hole, build up a surface, or mold material around a repair. Use liquid epoxy when the main goal is joining two surfaces and a clear finish is desirable. Putty is easier to shape by hand, while syringes or applicators can make two-part liquid mixing more straightforward.
What materials are you repairing?
Match the product’s listed applications to the repair. SteelStik and the steel epoxy putty are positioned for metal work. Boncart lists a broader range of materials, while ClearWeld names metal, tile, most plastics, ceramic, glass, and wood. For materials not listed, consult the product instructions rather than assuming compatibility.
How much working and curing time do you need?
A five-minute set, as listed for SteelStik, Gorilla, and ClearWeld, calls for careful preparation before mixing. Boncart provides up to 30 minutes to apply it and lists a 24-hour full cure. A set time is not necessarily the same as full cure time, so follow the product directions before putting a repair under load or exposing it to water.
Does the repair need water or heat resistance?
Compare the exact conditions stated for each product. SteelStik lists specific temperature limits and chemical resistance when fully cured. The steel epoxy putty is described as heat- and water-resistant, but the supplied details do not give numeric limits. Boncart’s instructions specifically say not to use it underwater.
Frequently Asked Questions
What does two-part epoxy mean?
Two-part epoxy uses a resin and a hardener that must be combined to begin setting and curing. Follow the package’s mixing ratio and instructions.
Is epoxy putty better than liquid epoxy for filling holes?
Putty is generally the more suitable format when material must be molded into a hole or shaped around an uneven repair. Liquid epoxy is better suited to bonding surfaces where it can stay in place.
How long does two-part epoxy take to cure?
Timing varies by product. SteelStik and ClearWeld list a one-hour cure, while Boncart lists a 24-hour full cure. Check the product directions for the specific repair conditions.
Can epoxy putty be used underwater?
Do not assume so. Boncart’s listed instructions say to avoid underwater use, and the other product details do not establish underwater application instructions.
Which option dries clear?
Gorilla 2 Part Epoxy and J-B Weld ClearWeld are both described as drying clear. SteelStik cures dark gray, while Boncart is described as white.