Castung 403 Z-3 (Dehydrated Castor Oil, Polymerized) is a bodied dehydrated castor oil polymerized to a higher viscosity. It has faster processing and drying times than Castung 103 G-H. This product also has the same non-yellowing and outstanding color retention characteristics. Castung 403 Z-3 is ideal as an aluminum paint vehicle because of its fast drying, flexibility and low acid value.