The problem is it is impossible to "prove" one way or another because each "layer" of product is so thin (I have been told about 1/1000th of a micron but I don`t know for sure if its true) that it cannot be measured with very expensive lasers.
I pure wax (with out cleaners) still contains the same very strong solvents that transformed little flakes of wax that where harder the concrete into a soft, pilable substance when the wax was in its natural forum. When you have a microscopically thin layer of wax on your paint and reapply the solvents back on top of the microscopically thin layer wax, combined with the aggitation of the new product being applied to going remove any wax not tightly anchored into the pours of the paint. The same product is going to be removed when the excess is removed.
Additonal coats probably do contribute to an increase in apperance as a more even coat is applied over the surface and more of the microscopic areas are coated.
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