Here is my Custom ROTF Megatron. He was painted with Humbrol Paint. First he was sanded down to give him a rough texture to create an effect to make out he has being under the ocean for 2 years. The rust was mixed with a brown and a black to give it a dark effect. I painted all of him with a crome silver then added the rust and dirt. His boosters on the back of him were painted black inside to create a burn effect to make out they have being used a lot.
I also painted his eyes red like in the movie. His tank treads were painted with a bronze paint then added silver onto them to make out they are scratched. Once I painted him I used a knife to create dints in him to make out he's in a lot of battles.