He was initially washed to remove any leftover mold-release agents that might interfere with paint-adhesion. Then, the cool gray portions are a rust-o-leum 2x Ultra Cover paint called "Winter Gray", and the purple parts were initially sprayed with the same type of rust-o-leum in gloss grape. Those parts got a coat of Krylon rich-plum over that.

The rest of the paint-details are done in acrylics from Testors, Tamiya, Games Workshop, and Vallejo. The original hands were removed, and I added in a socket to allow for removable 1/100 scale Gundam hands. The head was replaced with a modified head from a Construct-Bots Megatron.

I haven't had time to do any alteration of the modified cannon, but I've included an alt-mode photo with a cannon on-loan from a stock TR Galvatron.