How to stick things together with Sugru:

When gluing things together, it’s generally best to stick the smaller or lighter object to the larger heavier one.

Roll the Sugru into a small sausage and press onto the smaller object.
Shape the Sugru into a cone.
Press the smaller object, cone first, onto the larger object.
Use fingertips to smooth out any excess Sugru that has squeezed out.
Pro tip: This technique can also be used when working with round or curved objects.

How to apply Sugru to smooth materials:

Roll the Sugru into a small sausage.
Hold the sausage vertically and press one end onto the surface ensuring there is no shadow/gap.