Yeah it has to be gel deodorant, but a natural one works too, as long as its gel. You apply a generous amount to the skin, put the drawing (ballpoint pen) on face down, hold for a minute and it should give you a perfect mirror image. Let it dry then cover in vaseline.
Simply so, what kind of deodorant can I use for tattoo stencils?
Apply the roll-on Speed Stick brand (or generic equivalent) deodorant to the shaved area of skin. Be sure to cover the entire area, so that all parts of the stencil drawing will come in contact with the deodorant.