Making a mold for a part or miniature, can be easy, or a total nightmare and waste of money. I have experimented with making molds with a lot of different items. If you wanna try copy a part, or make a mold of something you made,I can give some tips, because I have made a lot failures.
Instant Mold or Oyumaru (hobbyist's best friend)
This stuff is amazing, I have a very small amount of it, and every time I use it I am just own back with the ease and the great detail of the casts.
Pros: Easy to use
Captures most detail amazingly
Works with both green stuff and resin
Molds can be made in under an hour
Cons: Pricey ( not so bad if bought in bulk)
Some detail will be hard for I to capture because its a putty, you have to "force" the detail into it( hmm onto it?)
After 10 to 20 casts the detail starts to ware off (its reusable so once you start to notice the diminish in quality you can just
reheat and re use)
Molding Silicone (The Pro stuff)
This stuff works well, is some what cheap, you can get starter kits with resin, was a little hard for me to track down a supplier. You really
need to know what you doing when working with this stuff, with Oyumaru all you really need is a cup of boiling water, silicone you need a scale, mixing containers, a vibrating platform, mold release and a vacuum box.( you only really need a vacuum box and/or a vibrating platform if your having problems with bubbles in your mold)
Pros: Captures detail amazingly well
The tin based ones can be very cost effective, and its what a hobbyist will use.
Molds can last if looked after correctly
Cons: Mistakes are permanent, only thing you can do with a bad mold is cut it into blocks and use it for filler on big molds to save some
Difficult to get bubble free molds, with the right tools and experience this wont be much of a problem
Takes up to a day to dry
Wont be able to cast with green stuff, only resin ( the mold is soft )
Yeah I could never get this stuff to work for me
Some house hold products.
Hot glue sticks
Pop it in a pot of boiling water, push it down on your part and hope for the best. Now you may be thinking why spend 10 times more buying some Oyumaru, well because stuff can go horribly wrong with glue sticks and it starts to get very hard. The pro is that's its cheap, but its glue and being sticky is not a quality you want in a mold.
Works with green stuff.
Cons: A mistake will cost you your part.
Feels like working with inferior Oyumaru
Silicone caulk( the kind that smells like vinegar )
Buy the clear silicone, wash it with some soapy water, push it down on your part. The stuff works well, takes some time to dry. Never really got a great mold out of it.
Cons: Might corrod metal parts, happened to me with my tomb spider
Wont work with green stuff ( the mold is soft)
That is all the stuff I have used, I would say if you want to try and make some molds for one or 2 off parts Oyumaru is great, anything more or bigger go with silicone.
Some links to tutorials I found very helpful.https://www.youtube.com/watch?v=SoMLvLuUlHchttp://dedard.blogspot.co.za/2012/04/resin-casting-1-part-molds.html
Will be adding some tips and info? I guess and some info on casting resins, ummm lost track in the next few days I think
Hope that was legible and helpful