Casting aluminium parts?

[capri71]

Does anyone here have any experience of making parts by lost wax casting? I made a pattern for my own throttle bodies and want to now make a silicone mold to make wax patterns for the final lost wa aluminium casting. Can anyone recommend brands and variants of silicone, wax and anything else they use? I know that using the wrong brand can mess everything up (Sip vs Clarke etc.) so any advice generally on doing this would be great. Im on the fence about getting it all done if anyone has any idea of cost? maybe someone here works somewhere they do this?!