Nano-emulsions have unique properties such as small droplet size, robust stability, translucent appearance and tunable rheology. These properties make nano-emulsions an attractive candidate for applications in the paints industry. Nano-emulsion were prepared by semi-continuous method and, then the prepared emulsion Co-polymer of Styrene/2 Ethylhexyl acrylate and Ter-polymer of Styrene/methyl methacrylate/2-Ethylhexyl acrylate formulated and used as a binder for waterbased paints to improve physical properties against (UV irradiation, heavy rain, and discoloration of paint). Characterization of the prepared emulsions was performed using e.g. FTIR, TEM, DSC, TGA, and DLS. Nano-emulsions formed by using two different surfactants (anionic and nonionic surfactant) in presence of K 2 S 2 O 8-initiation and caused to making two acrylic emulsion polymers. Based on formulated this prepared polymer and their use as a binder for paint. The adhesion, surface hardness, gloss brightness, and water resistance were studied and evaluated. Also, the purpose of this study is to improve UV irradiation by exploring the influence of different compositions on the stability of waterborne paints. And modification of the flow behavior and structure in predictable way to control sag resistance, storage stability, spatter resistance and application behavior. Keywords Nano-emulsion polymer, Ter-polymer water-based paints, 2-Ethylhexyl acrylate drug delivery, food, cosmetics, pharmaceuticals, and material synthesis. Additionally, they serve as model systems to understand nanoscale colloidal dispersions. High and low energy methods are used to prepare nanoemulsions, including high pressure homogenization, ultra-sonication, phase inversion temperature and emulsion inversion point, as well as recently developed approaches such as