For homebuilders, two-part epoxy is a good product for repairing, filling, or sealing anything that might contact moisture, such as a broken window sash, or rotten deck boards or thresholds. Many people consider the working time of epoxy and look no further, but there are a few other attributes worth knowing.

Strength varies

Slow-set epoxy is typically stronger than quick-set epoxy, though not by much. For example, Devcon’s 1 Minute Epoxy can withstand up to 1600 psi when bonded to steel, while its slower-setting 2 Ton Clear Epoxy stands up to 2250 psi. Strength also varies from one manufacturer to another. Devcon’s standard 5 Minute Epoxy tests at 1900 psi on steel, while Gorilla Glue’s five-minute version tests at 2600 psi. You can get away with a quick-setting epoxy for basic repairs, but when strength is critical, read product information carefully. Also, don’t waste your time looking for wood-to-wood strength ratings. They’re difficult to test because wood often fails before the epoxied joint.

Use the right epoxy for the right application

Most quick-set epoxies are water resistant, but slow-set versions are generally waterproof. This makes slow-set epoxy great for marine or other extremely wet applications.

Quick-set epoxies are most popular in cold conditions because they typically contain a mercaptan hardener, which allows for a faster, more thorough cure in cold weather. Quick-set epoxies are also a better choice for unclamped joints, whereas slow-set epoxies are strongest when compressed into a thin glueline.

Whether quick- or slowset, epoxies do not reach full strength for hours—usually 24 or more.

Fine Homebuilding Recommended Products

Fine Homebuilding receives a commission for items purchased through links on this site, including Amazon Associates and other affiliate advertising programs.

8067 All-Weather Flashing Tape

Available in 2- to 12-in. widths, this is a good general-purpose flashing tape that sticks well to most things. It features a two-piece release paper, water-shedding layers, and good UV resistance.

Buy at Amazon

Affordable IR Camera

This camera is super useful for tracking down air leaks in buildings. The one-hand pistol grip arrangement frees your other hand for steadying yourself while maneuvering tricky job sites.

Buy at Amazon

Handy Heat Gun

This heat gun is great for drying joint compound, primer and paint when patching drywall and plaster walls. Plus it can soften adhesive, get a very cold small engine to start, and shrink heat-shrink tubing.

Buy at Amazon