Just for future projects.... it doeasn't matter which of kind of "metalic" paints you use. These always make all imperfections easy noticable. Therefore all surfaces of a model have to be prepared properly for a such kind of painting. All seams , scratches etc.. have to be filled with either a putty or a primer then sanding and primered again in order to get smooth surfaces. Also all edges (e.g.. leading/trailing edges of wings) have to be sanded and cleaned to remove all overflows both of plastic and glue ones. All these details finished incorrectly cause the final appearance of a model being not too enough.
Looking good. That Rustoleum sounds like the smooth version of 'Hammerite' (Smoothrite), available in the UK, Europe and I think also in Oz. Normally used for painting metal gates, steel wheels etc etc.