Best applied over a 4000 Sealer. Most colors applied over 4001 Sealer White for a brighter value. Apply Deep Black and darker colors over 4002 Sealer Dark. Not intended for fine, detailed artwork with a small tip-sized airbrush. Contains fillers for opacity which prevent fine atomization at reduced pressures. Use as a color-keyed base for 4500 Series Sparklescent Color or 4300 Series Pearlescent Color. Semi-Opaque base reduces the amount of material required for a pearlized finish as the pearl color covers quicker in fewer coats than when used as a base color. Color-keying a base with a more expensive pearl mid-coat not only saves material, but it also reduces curing times. Excess coats of a pearl color applied as a base color for coverage require over a white sealer require a longer drying period than a few light coats over a Semi-Opaque base color. On average, Semi-opaque Colors dry faster than do 4300 and 4500 Series Colors due to the higher solids content in the Semi-Opaque Colors.