Step 2: Measuring and applying duct tape

Picture of Measuring and applying duct tape
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In this instance I'm using red duct tape. Measure 1.5cm by 1.5 cm on your duct tape. This is the area of a Rubik's cubes' sticker.
Make sure it is not too big so that it goes over the cubie.
Cut this out and stick it on the matching coloured side on your Rubik's cube. 
I would then recommend writing your initials or something on your Rubik's cube so that you know it is yours.

I wrote an 'L' on mine.