Fusion has a solvent in it (not present in most paints) that "melts" the plastic slightly causing a chemical bond. Most paints just bond mechanically which is why the surface should be sanded prior to application. However, if you spray it over anything but bare plastic there is no benefit. In fact, it probably does not work as well in that case or every paint would melt contain that solvent for plastic and chemically bond to it.



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