This study deals with the synthesis and investigation of the surface-coating properties of nanocomposite long oil alkyd resins which contain different ratios of organo clay. The aim is to investigate the effects of organo clay addition on the surface-coating properties of the alkyd resins. For this purpose, organo clay-modified long oil alkyd resins were synthesized by an in situ polymerization method. Alkyd resins were formulated to have an oil content of 60 % using a K alkyd constant system. The obtained nanocomposite alkyd resins were diluted with xylene of 60 % solid content, and films were prepared using 50-mu m applicators from these solutions. After the nanocomposite alkyd resin films had been dried at room temperature for 72 h, physical and chemical surface-coating properties and thermal oxidative degradations were investigated. In addition, surface morphology analyses of nanocomposite alkyd resin films were also performed by scanning electron microscope. Incorporation of organo clay into alkyd resin structure has significantly improved physical and chemical film properties and thermal stabilities of alkyd resins. As a result, long oil alkyd resins containing organo clay are suitable for manufacturing surface-coating binders.