This paper describes how to use the semi-empirical thermal expansion model, proposed in Part I of this paper (Fan et al.. 2010), to simulate the post-molding warping of injection molded parts during the post thermal treatment. The post-molding warping of a viscoelastic ribbed plate and a fibre reinforced ribbed plate are simulated using a finite element method. The results of simulations showed that the post-molding warping due to the thermal treatment for viscoelastic ribbed plate is much larger than the de-mold warpage. in contrast to results for fibre reinforced ribbed plates.