Hi Max, I could do them in the lathe but it is time consuming, but I might give it a try on a set of wheels, nothing to loose.
MF, I will leave the wheels for a couple of weeks so they harden up. I did a set of front wheels last night, the surface looked pretty good when I did them but once they dried over night it ended up with a few imperfections. I might try a wipe of body filler over it. Too much messing around to keep the white, can't loose sight of the fact they are just mower wheels