A mathematical model of blade coating is developed to study the rheological and viscoelastic effects of a Simplified Phan-Thien-Tanner fluid passing through the narrow gap between the blade and moving substrate. First, a dimensionless analysis is conducted on the governing system and simplified by utilizing the lubrication approximation theory. The perturbation method is adopted to solve the resulting non-linear system. The impact of parameters Wi (Weissenberg number), epsilon, and gamma (normalized coating thickness) on the velocity and pressure profiles are elaborated through graphs, while coating thickness and load are shown in tabular form. The results exhibit that the viscoelastic effects have a significant influence on the pressure and load on the blade as they lead to the thickness and better coating quality and improves the life of the moving substrate.