The Mouldmaking & Casting Forum

Hi

I want to make quite a few halloween props , a bunch of sledge hammers and also hands . What would be the most cost effective products you have to use for the process of casting and the mold .

Im making quite a lot so the mold needs to stand up to repeated casts .

Thanx for your time and get site

Regads

Chris
Melbourne

Hi,
I would use a silicone mould using CraftSil and cast a self skinning polyurethane foam into this mould. There are several densities of foam you can use, you would probably need one of the hardest. I would also use a wax release followed by PVA mould release to ensure you get a good release from the mould as polyurethane sticks to almost everything except silicone and to begin with I would take no chances. Get in touch if you need more help. Stan

aldaxmoulds wrote:Hi,
I would use a silicone mould using CraftSil and cast a self skinning polyurethane foam into this mould. There are several densities of foam you can use, you would probably need one of the hardest. I would also use a wax release followed by PVA mould release to ensure you get a good release from the mould as polyurethane sticks to almost everything except silicone and to begin with I would take no chances. Get in touch if you need more help. Stan

Hi Stan thanx for the reply

What is the name of your hardest foam and how much carftsil at a guess do you think i would need to purchase .
Thanx again
Criss

Hi, It is hard to guess how much silicone you would need I would start of with 1kg and see how you go. The Foam has a maximum density of 200 however I would use 100R-Foam to start with as this is usually strong enough for most projects. Foam can also have a resin such as Craft Cast painted on the ourside to make it very hard to the touch if required. R-Foam is $55.00 2kg the smallest pack available. All the best Stan