Sugru has become my go-to DIY material. First I consider if the job can be done with Sugru, and if it can, I will.
Magnets add a an extra dimension of usefulness - and although you can buy Sugru branded magnet packs, it is in fact cheaper to buy alternatives in bulk.
The first part of this project is a magnetic mount for a solar step light on our back path. Not much point wiring up a light when this location faces South west and gets oodles of sunlight.
The magnetic mounts mean no drilling, some adjustment possible in the exact position of the light, and of course completely undoable without damage. The solar light is metallic and will stick without modification. Quick, clean, simple, no tools!
Part 2 of the project is to position the mount for my new netatmo outdoor sensor. It's just a plastic clip with a lug on it. As it has no screw holes, Sugru is perfect to mount it. The ideal position is under the front porch canopy.
I used white Sugru and once afixed stuck some of the render chips back on top of it, so you can hardly see it. Very pleased with the result. The netatmo sensor just slides onto the lug. Again, quick, clean, simple, no drilling, no damage! I love Sugru!