Much more complex - to start off just use slush molding and move on when your comfortable with that. Buy a cheap RTV Silicone off ebay and some GP resin and experiment with a few simple bodies and fittings until you get a feel for making masters,avoiding air pockets and gel times etc. You can get very good results using simple methods and cleaning up the cast afterwards. Only move on (and spend more money) when you feel you need a better finish.
It is and it isn't. Different organism. Much more fluid than white metal and can stay runny for longer. Mould is different in that white metal you can split down the middle and cast down the join Resin needs to be retained and flow. You need many more vents. Its a bit more like casting in green sand with alloy. Also your mould does not need to be as thick to cope with heat but may need support so does not deform the pattern.
Two piece replicates the master so you get internal details and your master defines the thickness. Slush one part moulding can be thin but takes a lot more working to keep the resin spread.
I jumped straight into 2-part moulding and it worked more or less straight away. The best 'How-to' in my opinion is on Slot Blog HERE (you'll need to register). I still do 1-part for most components, though, like heads, wheel inserts etc (it's surprising what small difficult spaces resin will crawl into!)
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