IHeartTurbo Proven Member. Just my $0.02 Jan … JB Weld works best at room temperature, so if possible keep your repairs indoors if the weather is cold until it gets a chance to cure. J-B Weld has a tensile strength of 3960 PSI and sets to a hard bond overnight. MarineWeld™ sets in 20 minutes at room temperature. … "JB Weld" high strength epoxy cure time is about 24 hours. J-B MarineWeld™ is a specially formulated two part Cold-Weld™ adhesive system that provides strong, lasting repairs for bonding different or similar surfaces, such as metal, composites, fiberglass and others. After curing, it can be drilled, tapped, filed, sanded and painted. 3,449 15. in reply to Willy P, 03-21-2005 19:09:39 Heat helps some, but try putting a layer of masking tape over the crack once the JB is in to hold it in place. JB Weld cure time vs temperature: You can decrease the cure time by increasing the temperature of your working environment. Never compared them myself, but have heard the fas curing isn't quite as strong. Mixed at a ratio of 1:1, it forms a permanent bond and can be shaped, tapped, filed, sanded and drilled after curing. The package says it takes 15-24 hours to fully cure but doesn't specify if low temperatures can make it take longer than that. What is JB Weld good for? Question about JB Weld drying time. . I think you will be fine. WaterWeld™ cures to an off-white color, is rated at a tensile strength of 1300 PSI and will withstand temperatures up to 300ºF. CURE AND SET TIME: After mixing the tubes at a 1:1 ratio, it takes 4-6 hours to set and 15-24 hours to cure. If you nail goes into the repair, it is not ready. Two attempts now (with the full 15 hours curing time each) have failed miserably, with the head popping off merely from my attempt to screw it back in place (there is a spring which fits into the hollow section of the bolt which applies pressure as the bolt is tightened). Re: How to cure JB Weld faster? You can test the repair’s completion by pushing your fingernail into the repair. Posted by 98FWDSM, Jan 15, 2005. Yes, heat will speed up the cure time. Jan 16, 2005 #5. I let mine cure for 24 hours. A full cure is reached in 15-24 hours. Just curious if anyone has any idea how much cold weather (~35f specifically) impacts the cure time of this variety of JB weld epoxy. Placing the glued piece in an oven under 200 degrees Fahrenheit cures it in 30 minutes or even less. I have used JB Weld to fix pinhole leaks in welds and stuff and it has held up to pressure in much less curing time than 15 hours. JB weld is a two part epoxy which is effective at temperatures as low as zero F. At temperatures below 50 F and above 32F the cure time is about double, 10 to 30 Minutes as compared to the 5 to 15 min at room temperature but the finished bond strength is not affected. Once cured, J-B Weld Original can be tapped, filled, sanded, molded and drilled. . J-B Weld is a two-part epoxy adhesive (or filler) that can withstand high-temperature environments. J-B Weld Original’s set and cure color is dark grey. At room temperature, J-B Weld sets in 20-25 minutes to a dark grey color. Cure – The cure time of JB Weld ExtremeHeat is 2-4 hours for set up, with full cure in 24 hours. It is very important to give the paste a full 24 hours of cure time before putting the part back into service. Ill show you guys how to use JB Weld SteelStick, some pointers for using it and how effective it is as an alternative to welding. Screw it down hand tight and let it set for 24 hrs. WaterWeld™ has a set time of 15-25 minutes and sets hard in one hour. (The bolt plugs the drain in the oil pan of my 49.5cc scooter.) I have used JB Weld to fix pinhole leaks in welds and stuff and it has held up to pressure in much less curing time than 15 hours.