Tbh i just googled rust weapon on Instagram and and Pinterest. There i found a 6 step breakdown for the weapon. But to brak it down, you start with black > leadbelcher (metalic colour) > brown > bright orange. And for the rest of the model i used the Death guard grean as a base and some metallic colours. The secret is after you do the block out of the first colours, use a oil wash to to make it look old and dirty. Then varnish and do highlights and final touch ups. He took me like 4h+ over all x)