Renewable Castor oil (CO) and dehydrated castor oil (DCO) were used for the synthesis of new alkyd-urethane resins via a two-stage process. The cured films from both alkydurethane resins exhibited similar hardness, adhesion, chemical and water resistance, and gloss. Gouge hardness and scratch hardness were 3H and 4H, respectively. The adhesion of both films was good. Cured films were resistant to water, xylene and H but they were slightly affected by NaOH and strongly affected by acetone. DCO resin showed lower drying times than those of CO resin. Yurany Villada et al., Progress in Organic Coatings, Volume ...