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By pressing quite hard with my fingers in a pattern that "chases" out any gaps beneath the vinyl fabric, I've gotten good results. If the material is a little bit too "grippy" for your fingers to slide on, put a piece of paper down first. Otherwise, any rounded object should work fine. It need not "roll" - sliding is fine. In similar applications, I've even used the rounded handle of a paint brush. A common table spoon works well too. Don't rely on the strength of the spoon's handle, as it will bend. Apply pressure with a finger or thumb placed right into the cup of the spoon, and rub the material with the curved back side.