Know-How Notes: How To Use JB Weld KwikWeld
JB Weld has tons of products available for specific types of repairs, but the generic epoxies – JB Weld and JB Weld KwikWeld are the main types. This particular article is all about KwikWeld, the fast-setting version of JB Weld epoxy. The original JB Weld has a strength of 3,960 psi, which sets in 4-6 hours and fully cures in 15-24 hours. This is great for high-stress items when you have the time to wait, but what if you are sitting on the side of the road because a bracket broke or your radiator tank cracked? That is where JB Weld KwikWeld comes in. The strength is lower, KwikWeld is rated for 2,424 psi, but it sets in 6 minutes and fully cures in 4-6 hours, so you can get back on the road much faster without the overnight wait. The other trade-off is temperature; JB Weld KwikWeld is good for up to 300 degrees, while the original version is good for 550 degrees.
Using JB Weld KwikWeld is just like the original version. Surface preparation is everything. A clean surface is absolutely necessary for a strong, secure repair. Be sure to remove all dirt, grease, oil, or paint from the surface. If you have some cleaner available, like brake cleaner, use that. For smooth surface repairs, we would use a little sandpaper (80 grit is good) to rough up smooth surfaces. If you are dealing with cast iron or aluminum, the rough casting should be good as is once cleaned.
Mixing JB Weld KwikWeld is easy, just make sure that you mix both components in equal portions. It does not have to be perfect, but it needs to be pretty close. We find it easiest to meter out the components next each other in a straight line. This ensures that the components are equal.
Use a mixing tool to blend the components together. In the shop, we use a razor blade, but another good item a plastic scraper blade. Cardboard or scrap wood make a perfect mixing board.
Once blended, scoop some up and put it on one side of the broken part, then marry the parts together. Use the mixing tool to clean up the edges where the epoxy squeezed out. Depending on the part, you may want to leave a little extra around the joint to help secure it.
Let the repair rest for six minutes. If you can clamp it together, that is a good idea. If not, just hold it together. The epoxy will be fully set in four hours at room temperature. If it is below 40 degrees, it will take longer.
JB Weld KwikWeld is the perfect multi-purpose epoxy for your garage, home, and in your car. In fact, keeping a tube in your car’s toolbox (you do have a proper toolbox in your trunk, right? RIGHT?) is just a good idea.
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Jefferson Bryant View All
A life-long gearhead, Jefferson Bryant spends more time in the shop than anywhere else. His career began in the car audio industry as a shop manager, eventually working his way into a position at Rockford Fosgate as a product designer. In 2003, he began writing tech articles for magazines, and has been working as an automotive journalist ever since. His work has been featured in Car Craft, Hot Rod, Rod & Custom, Truckin’, Mopar Muscle, and many more. Jefferson has also written 4 books and produced countless videos. Jefferson operates Red Dirt Rodz, his personal garage studio, where all of his magazine articles and tech videos are produced.
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