First, it does NOT (repeat, does NOT NOT NOT) "fully cure in 1 hour".
Performance varies. It usually gets "most" of its strength after 10 minutes, but I have seen it take up to several hours, even a whole day, to really get 100% rock-hard. By one hour, it is probably 90%
Successful uses:
Filled a crummy car stereo knob. Hard to explain, but easy to understand if you have ever seen it. The internal tube, which slides over the stereo's shaft, always cracks and comes loose. I filled the hollow portion of the knob with quicksteel, and it will now last forever. Quicksteel seems to handle high heat much better than any other substance, and doesn't shrink over time, which is critical for this use.
Wrapped some around a stubborn piece of hardware that wouldn't unscrew, and was not shaped for any kind of wrench. The quicksteel dries on like glue, and could be shaped to grab with real tools. It's hard to remove, so it's only for desperate situations.
Filled in the handle portion of my "Gerber Artifact" tool. This stuff is good for filling gaps or holes in stable objects.
I would not use it for structural repairs. It may be hard, and fairly strong, but it is also brittle and lacks extreme abrasion resistance. These are all different properties. I wouldn't use it for anything that will take a lot of impact or vibration.
Quicksteel is also at risk of being weakened by bubbles and small spots of unmixed ingredients, so it's not for anything that would be dangerous if it failed.
We were on a motorcycle trip from Seattle to Malibu. On our return leg I broke my clutch lever (cast aluminum). As we wondered what to do, I remembered that we had bought some QuickSteel to patch the muffler on my wife's bike a few days before (it worked well), and decided to try to make a quick fix before we tried to find a replacement - and Moto Guzzi dealers are not that common, so we figured we'd lose at least a day trying to get back on the road. I pieced the clutch lever back together, using QuickSteel as an adhesive to hold the parts together. When the first fix had cured for almost an hour I looked and decided to add some additional reinforcement at the stressed edges of the repaired area. Total fix & cure time (the first batch was completely set up by the time we mixed the second batch) was abut 1.5 hours.
I fully expected the lever to come apart when I used the clutch, but it managed to hold together all the way from Northern California to home. I showed some of the guys at the local Guzzi shop what I had done, and everyone pretty much decided that this would be an excellent addition to their motorcycle toolkits. The repair held through city traffic (lots of clutching), and we managed to be back on the road within about 2 hours, instead of the expected day or two.
Great stuff! It works as advertised (or better), and held up beautifully in an application where I really expected that it would not be adequate. I'll definitely be carrying a tube of this with me from now on.
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