yeah it can, i had a strange problem where i maybe had hammerite on the inside of my arches and i used gravitex underseal and it all reacted and basically striped it all bare haha! but i have used hammerite underseal ontop of hammerite paint before, just make sure its all clean etc :)
Thanks for this, this is what I wanted to do exactly, I want to paint the insides of my wheel arches in black hammerite and then apply hammerite wax oil underseal (spray on) over the top of this... Cheers for this.
Chris.
Edited by chrscmbs, 21 March 2012 - 12:15 PM.