After the black wash was dry, I used GW Averland sunset to do any clean up work, and then applied 2 thin coats of GW Yriel Yellow. I lightened this further by applying a layer of GW Flash Gitz Yellow. All of the banding on the armor plates were painted first with GW Mephiston Red, followed by a layer of GW Evil Sunz Scarlet, and an edge highlight of GW Wild Rider Red.
Tonight, after work, I applied the same process to the riders.
After painting everything else, I painted the helmet on the Veteran Sergeant with the red combo from above. On the molded Imperial Fist shoulder pad, I painted the raised disk and fist GW Abaddon Black. I then applied a highlight or GW Fenrisian Grey, and then painted the disk with 2 thin coats of GW White Scar. The power cells on the plasma guns were given a basecoat of GW Fenrisian Grey, with an edge highlight of GW White Scar, and then washed with GW Drakenhoff Nightshade. I like this look better than the tacky "glowy coil" way that everyone else wants to paint plasma weapons.
I then went ahead and glued the bikers to the bikes. Now I will apply an edge highlight to the yellow with a 50/50 mix of White Scar and Flashgitz. I hate the way yellow looks with white highlights, so the faint edge highlights will stand out once matte varnished.