hi i have taken on an aluminium casting project for my engineering college project and possibly make a bit of money from it.
my plan is to produce cast aluminium car fuel caps. (like the classic aston ones)
my plan was to use RTV silicone to produce a resin copy of an existing cap i have borrowed and then use that to form sand moulds to cast with.
my reason for making a resin copy is that it will need alteration (hole filling in etc.) before i can make the sand mould.
what i would like to know is
is rtv silicone and casting resin the best way to achieve this
is there anything cheaper than RTV i can use as I'm on a tight budget and have calculated i will need 5 L of RTV to achieve this
any info or advice would be much appreciated
thanks