You can use Sugru to cover up normally sharp edges. In this case, I had an exposed metal thread at the junction between a pipe and a flange it screwed into. When Sugru sets, it becomes relatively hard and can prevent incidental scratches and cuts.
Step 1: Find something that you might cut yourself on.
Step 2: Apply enough Sugru to the area to create a thick barrier
Be careful that you don't push too hard while the Sugru is still soft and accidentally cut yourself.
Step 3: Use a flat object (like the edge of a credit card) to make the edges look neat.
Follow the directions on the package. Once you have exposed the Sugru to air, you have a limited time to make changes before it begins to harden. Work smoothly and you will have more than enough time to clean up the appearance.
Step 4: Allow 24+ hours for the Sugru to set. Enjoy your newly safe object!