I use a general casting resin I get from the fibreglass suppliers here. 50 50 mix with metals by weight. I dont have much issues with sedimentation of the metal powder tho we normally cast top surface down or actually paint it into the mould , the metal powders are very expensive , so large volume objects we fill with plaser of paris and lead shot for "authentic" weight.
Rodney Gold, Toker Bros trophies, Cape Town , South Africa :
Roland 2300 rotary . 3 x ISEL's ..1m x 500mm CnC .
Tekcel 1200x2400 router , 900 x 600 60w Shenui laser , 1200 x 800 80w Reci tube Shenhui Laser
6 x longtai lasers 400x600 60w , 1 x longtai 20w fiber
2x Gravo manual engravers , Roland 540 large format printer/cutter. CLTT setup
1600mm hot and cold laminator , 3x Dopag resin dispensers , sandblasting setup, acid etcher