Butyltin trichloride is primarily used as an intermediate in the synthesis of other organotin compounds. These compounds are widely applied in the production of PVC stabilizers, which help prevent the degradation of polyvinyl chloride (PVC) when exposed to heat and light during processing and use. Additionally, it serves as a catalyst in various chemical reactions, including the production of polyurethanes and silicones. In the coatings industry, butyltin trichloride-derived compounds are utilized to enhance the performance and durability of paints and coatings. It also finds applications in the manufacture of antifouling agents for marine coatings, which prevent the growth of organisms on ship hulls.