I am in need of some 1/4 scale exhaust stacks, and it seems no one produces what I need. So I am considering casting my own from resin. I think I can carve a plug ok, but I am looking for a website with instructions for making molds and actually casting the parts. I think what I need to do is make a mold from some sort of silicone, but not sure. Let me know if you have done this, or where to learn how.
Thanks

these guys can tell you all you need to know

http://www.hyperscale.com/default.htm

Try here: https://www.cstsales.com/How_to_Articles/index.htm