The present invention provides 
chip-resistant 
powder topcoats for 
corrosion resistant 
powder coated steel substrates, such as, for example, automotive suspension coil springs, comprising 
powder coatings formed from one or more 
wax and a resin component of one or more toughened 
epoxy resin. The present invention provides dual coatings of toughened 
epoxy powder basecoats and topcoats, which may be foamed and / or 
fiber reinforced. The powder used to form the 
chip resistant topcoat can further comprise up to 200 phr or, preferably, up to 75 phr of one or more 
extender, or 0.5 or more phr of one or more 
extender, such as 
barium sulfate, while fully retaining its 
chip resistant properties. In addition, the powder used to form the chip resistant topcoat can be a 
low temperature curing powder comprising one or more 
low temperature curing agent. The invention provides methods for making the dual coatings comprising applying to the substrate a toughened, 
zinc-loaded, 
epoxy coating powder, applying to the powder coated substrate a 
wax containing toughened epoxy topcoat and heating to fuse or cure the 
coating powders.