Currently, plastic composites are widely used in daily life, such as household appliances, furniture, and automotive. The composite material consists of a matrix and a filler. Polypropylene as a matrix has been used in the automotive industry because of its affordable price and elastic and lightweight material properties. There is abundant coating waste powder that has not yet used optimally. Therefore, this research tried to use it a composite filler for vehicle interiors. This study aims to determine the effect of coating waste particle size on the bending properties and hardness of the composite waste coating/polypropylene. This research was conducted by making multipurpose specimens according to ISO 294-1: 2012 standard. The specimens from of polypropylene composite materials filled with 15% waste coating and particle sizes of as-received particles, 200 mesh, and 400 mesh were fabricated using injection molding method. Mechanical tests carried out in this research were bending and hardness refer to ISO 178 and ASTM D2240 standard, respectively. The results showed that the bending strength value of composite as-received, 200 mesh, 400 mesh did not increase significantly, but the modulus of elasticity increased by 1.26 GPa, 1.37 GPa, 1.39 GPa and 1.48 GPa. The hardness value on Polypropylene composites with as-received waste coating filler, 200 mesh 400 mesh is 59.36, 64.57, and 65.93 shore D. , respectively. Based on those it can be concluded that the addition of a waste coating filler makes the modulus of elasticity of the specimen increase so that it makes it stiffer.