Well, you are thinking a little hard about this. The reason that I do this (and that is not all the time by no means), is when I am working in conditions that are not ideal. Usually, this means that I am in direct sunlight on a hot day and the surface of the car is hot also. This causes the product to create a lot of dust and that is what I try and keep out of the cracks. No, the dust does not stick to the tape. The tape only keeps it from going all over the place inside the cracks. That's the only reason I do it and the only time I do it. When I am working in my garage, I seldom use tape unless I am covering up a sharp edge on an emblem which can instantly destroy a pad or I am using a rotary of factory or thin paint.