The lasting of a coating system over time depends on many factors, including an proper choice of the type of wood to be painted and the optimal coating system to achieve the desired performances. Polishield is a series of waterborne systems for exterior specific for windows and doors, that are guaranteed up to 10 years. All the systems have a common composition, they include the application of a suitable impregnating agent for softwoodor hardwood, a clear immersion sealer, a clear or pigmented sealer applied by spray, and a clear or pigmented topcoat applied by spray in a or two coats. The products are formulated with special additives that increase the stability to sunlight, the mechanical characteristics and the degree of protection of the coated wood.