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Sugru is like a cross between silicone and plasticine, that sets to be like solid rubber. Price has dropped 23% at Amazon, now at the lowest price according to CamelX3 history: https://au.camelcamelcamel.com/product/B089WJ221N
Edit: black has increased in price, so I've removed it from the deal.
The link to the right is for three packs of white Sugru. The grey and black varieties can be selected from that page. There's also a red, blue and yellow variety pack listed for $1 cheaper, at $8.99.
Sugru is excellent for repairing things, or for modifying things. My mum has a medical emergency pendant and kept accidentally pressing the alarm button when she leaned on things, so I added a ring of sugru around the button and it hasn't been accidentally activated since (the button still works fine, in case you're wondering). I've also used it on a dishwasher door that has sharp corners, to cover the sharp corners and be much less likely to cause injury.
Sugru takes about 24 hours to cure for a thin layer, longer for thick sections. Once it has set, it's about as hard as the rubber feet on household items. It's actually a mixture of (mostly) silicone and talc, and it seems to stick to anything that silicone will stick to. Once you've opened a pack it will start to set, so queue up a few repairs if you don't think you'll use a full pack on a single repair. This deal is a 3-pack of Sugru. Each pack contains a lump of Sugru with roughly the same volume as a sugar cube.
Sugru goes off with time, even when unopened, lasting about a year from the date it was manufactured. Wikipedia says it ages three times slower if you keep it in the refrigerator: https://en.wikipedia.org/wiki/Sugru
If you want to see what people do with Sugru, google "Sugru repairs", and view the images.
Packs of 8 are also at a very good price!