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I've had some batches that stayed rather soft for months, and others that turned quite firm within a day or two. Probably related to the coloring I used. I have a bunch of fountain pen inks that I tried, as well as food coloring, and india ink,.
I haven't had a lot of success with this stuff sticking. I've tried using it like a rubber shield on several objects (thermos bottles, car keys, keychain lights, etc.) and it always lets go a lot easier than I'd prefer. In the picture is a bumper I made for a battery bank. Those holes are where neodymium magnets were stuck. They held for about a week of use before I started finding them stuck to each other instead of the battery. In this application, it's held onto the plastic case quite well. Not so much, the car key, bottles, etc.
I have more trouble keeping it stuck than removing it.
It is way stiffer than the foamy flip flops I grew up with. As for furniture... well, I've used it with some success as keyboard feet, phone charger feet, etc.
Enhanced DeWalt Drill Before And After
Make Your Own Boombox
Magnetic connectors for batteries
Car Dash Tablet
How to Make a Sliding Tray Box With Hidden Compartment
Convert Your Old Laptop Battery Into a Power Bank
Red Copper Ring
How to Fix a Copper Pipe...WITHOUT Soldering