What is the difference between a positive (additive), and a negative (subtractive) technique?
A positive (sometimes called additive) technique is where you add glaze to the surface with your applicator. A negative (sometimes called subtractive) technique is where you apply a thin layer of glaze to the surface with a roller or brush, and then remove the glaze with your applicator. The positive techniques show more of the original Base Coat color, while the negative techniques show more of the glaze color.