JB Weld is widely known as the champion in specialty epoxies for metal repair, especially on vehicles. This is the professional size of their steel-reinforced epoxy for metal repair. These larger 10 ounce tubes ensure you'll have plenty of epoxy on hand for many projects. I personally prefer buying my epoxy in larger packages like this, as it's both cheaper and I end up with less waste. Typically syringes and tubes always seem to go bad before I can use them all up. On the other hand, these larger bottles keep the two parts clean and separate, for easy use. This isn't a fast-drying epoxy, but rather one that gives you plenty of time for working with the metal. It sets in 4 to 6 hours and fully cures in 15 to 24 hours, depending on temperature. Once cured, this epoxy can be sanded and drilled. The tensile strength of this selection is 3960 PSI and can withstand temperatures up to 550 degrees Fahrenheit when fully cured.
Loctite's heavy duty epoxy is almost as strong as the J-B Weld product, with 3500 PSI of tensile strength. Use it together with fiberglass cloth for even greater strength. This is a quick curing product, giving you a mere five minutes of working time. However, for many applications, that's enough. It works well with a wide range of substrates, regardless of whether they are porous or not. While waterproof, this epoxy product is not recommended for use in applications where it will be constantly submerged in water, nor should it be used in applications above 120 degrees Fahrenheit. It's amber clear in color, it can be tinted with earth pigments, cement, or sand, and once cured it can be sanded and drilled. This epoxy comes packaged in twin four ounce bottles.
This fast-curing epoxy from Bob Smith Industries cures to a slightly flexible consistency. This makes it perfect for use in applications where there is high vibration or substrates that are not totally rigid. This adhesive works with a wide range of substrates, including unusual ones like soft woods, hard plastics and white foam. Although it doesn't have the highest tensile strength, it cures quickly, giving you five minutes of working time and parts that are ready for handling in 15 minutes. It can be coated with polymer resin without affecting the curing of the resin, something that not all epoxies can do. Mixing it with microballoons (also available from Bob Smith) allows it to be used as a quick-setting putty, great for filling and repairing damaged wood. Packaged in two, four ounce bottles.
T-88 is a true structural adhesive, which can be used for attaching wood parts together where fasteners might not be applicable, due to difficulty of installing the fasteners or expected problems with holding power. This epoxy cures to a transparent amber color that all but disappears when varnished. It is unique in that it can even be used on damp wood, without loss of strength. As long as the epoxy is worked into the wood with a brush. It's also incredibly strong, offering a tensile strength of 7,000 PSI when cured. It does not shrink when curing and remains flexible (even when fully cured) and will cure in temperatures as low as 35oF. The cured epoxy is unaffected by water, oil, kerosene and many other chemicals.
This is a true marine epoxy, which can be used for bonding, filling, and repairing damaged wood. It works as well for fiberglass, making it ideal for bonding wood and fiberglass together. Featuring a creamy paste consistency, it can be applied on horizontal or vertical surfaces. The heavier body helps it to fill gaps and rebuild damaged components. For bridging holes, fiberglass cloth or any other sort of cloth can be used as a filler and strengthener. Finished repairs are fully waterproof, allowing this epoxy to be used below the waterline. Cured, this epoxy can be sanded, ground, drilled and tapped. It accepts paint and many other coatings well.
In addition to the liquid epoxy that JB Weld makes for wood, they also provide an epoxy putty specifically formulated for working with wood. I believe this is the only epoxy putty specially formulated for wood that's available on the market. It is specifically formulated to use as a filler, repairing and rebuilding wood that has become damaged. It contains no solvents, so it will not stain, or leave any chemical residue which will soak through paints and other finishes. The epoxy putty has a 15 to 25 minute work life and fully cures in one hour. Cured, this epoxy putty provides 900 PSI of tensile strength. It can be machined (including drilling, tapping and sanding once it is cured) while the light tan color accepts paint well.
The big issue with metal epoxies is the tensile strength of the cured adhesive and that's why I picked Permatex SteelWeld as the number one metal epoxy for this list. This product provides an amazing 4500 PSI of tensile strength once fully cured. This is actually a two-part epoxy, packaged in a twin-tube plunger which makes this product quite easy to work with as the plunger ensures equal parts of the epoxy are dispensed for mixing. It is a very fast-acting adhesive, giving you only four minutes of work time with a full cure taking hold in 24 hours. The cured adhesive can be drilled, sanded, or threaded in addition to also having excellent gap-filling capability.
JB Weld SteelStick is a steel reinforced epoxy putty. That means it has steel flakes in it, as a filler. The steel flakes work like fiber reinforcement would, making the cured JB Weld a very hard mass. Once cured, JB Weld can be drilled filed and tapped, making it ideal for automotive or machinery repairs. It handles high temperatures well, up to 300 degrees, making it ideal for vehicle exhaust systems. The putty sets in five minutes and fully cures in 1 hour, resulting in a final strength of 900 PSI. Although it is steel reinforced, it won't rust.
Super Glue, the company who first gave us the adhesive by that name comes in as my number one choice for plastic epoxies. Their Plastic Fusion formula is an acrylic epoxy that not only works on plastic, but a host of other common materials as well. The twin-tube plunger gives you an equal amount of both resin and hardener which makes measuring and mixing easier. This adhesive gives you a three to five minute work time, with an 8 to 10 minute set time, taking on a light yellow color as well. That's a little longer than most fast-setting epoxies so you have plenty of time to position your parts and parts are cured enough for handling in 30 minutes. Capable of gap filling to 1/4", this epoxy has an amazing 4000 PSI shear strength, much more than the substrates that it will be applied on.
Loctite's plastic epoxy is designed for use with a wide range of plastic substrates, including oily plastics, such as Nylon. It also works for: PVC, polycarbonate, acrylic, ABS, FRP, Mylar, Derlin, and phenolic as well. When you need to bond plastic to other materials, this epoxy works equally well with aluminum and stainless steel. Finished tensile strength is 3450 PSI and the twin plunger dispenser provides just the right amount of adhesive to mix for your project with full strength is reached in 20 to 25 minutes. This product is resistant to water, most common solvents, and shop fluids; however, it should not be used in applications where it will be completely immersed in water. It can be sanded and drilled when dry and the dry color of the epoxy is cream.
Permatex bills their plastic epoxy as a "structural adhesive", a title which can actually be used with all epoxies. The difference here though is that they intend for their product to be used in structural applications, especially when plastics need to be bonded to other structural materials. This epoxy not only bonds to all common plastics hard and soft, but also to common architectural materials such as ceramics, wood, and composites. The mixed adhesives sets in 5 to 6 minutes and is fully cured to a "fixturing" point in 9 to 10 minutes. You can use this epoxy for gap filling up to 1/8" and it has good water resistance and chemical resistance. Cured strength is 3500 PSI and the color is black.
Rectorseal is an industrial supply company, providing specialized products for the building and maintenance trades. They give us a little more to work with, by packaging their epoxy putting in a four ounce tube, rather than the conventional two ounces (they also have two ounces if you want). This is a fast-acting epoxy putty that fully hardens in 15 to 20 minutes, a third to a quarter of the time that its competitors do. You'll have to work quickly with it, but you won't have to wait a long time for it to cure. Once cured, it can be machined, sanded, painted and tapped. This epoxy putty can withstand temperatures up to 500 degrees and has been pressure tested to 1300 PSI.
POR-15 provides products to the automotive repair market, including auto body repair. Their epoxy putty is intended for this market, to provide a means of filling damage, while bonding surfaces together. Unlike the other epoxy putties on our list, this one comes in two separate bars (rather than one with the two components side by side or concentric), so you have to cut them both off equally. That's actually an advantage, as it allows the unused putty to be stored longer. You can work it all the way up until the time it dries. Wetting your fingers allows you to smooth the surface, eliminating most sanding.
This is a straight marine epoxy packaged conveniently in cans. While we're highlighting the one pound package here, it's also available in packages up to 10 gallons for those big projects. This pick has been special formulated for using underwater when necessary, so that repairs can be made underway. The high-tack mixture holds well to all surfaces, even vertical and overhead surfaces while working. If necessary, the epoxy can be reinforced with fiberglass cloth or wire screening, especially when working on large voids and gaps. This isn't a fast-drying epoxy, but rather one designed to give you ample working time for even the most difficult repairs. Once cured, the epoxy is an off-white color and can be sanded, painted, drilled, machined, cut or tapped.
JB Weld's marine epoxy is specifically formulated for situations where metal parts need to be bonded together in a "cold weld" or to other surfaces and remain bonded even underwater. Although it is a marine epoxy and is waterproof once cured, it's not intended to be applied underwater. This is a high-strength epoxy, with a tensile strength of 3690 PSI. The epoxy sets to a grey color in four to six hours and is fully cured in 15 to 24 hours. Once cured, it can be shaped, filed, sanded, machined, drilled, and tapped. This selection comes packaged in separate tubes.
This is a different sort of marine epoxy, designed as a coating, rather than as an adhesive. Although it is a two-part epoxy product, it has a much thinner viscosity than most epoxies. It also cures to a high-gloss finish, making it an ideal coating for wood tables and trim on boats. Once cured it's waterproof, scratch resistant, and doesn't distort with age. Items coated are permanently preserved with a maintenance-free, high gloss finish. This is a two quart kit, but it's also available as a two gallon kit for larger jobs.