To provide a heat resistant substrate having an excellent application property of paint, a method of manufacturing for the same and a coated product.

A heat resistant substrate having an excellent coating property comprising a composition including 100 pts.mass of a polyethylene terephthalate resin and 0.1-30 pts.mass of a talc having an average particle size ≤15 μm: a method of manufacturing for the substrate by injection molding the resin composition retaining the mold temperature at ≤60°C: and a coated product obtained by coating a surface of the substrate.