Just surfing the net during my lunch breaks and came up with a product called Gelsil M4770 silicone which can be used to make Jighead moulds. So does anyone have any experience with using this product.
They only retail for $52 for 1.1kg of the stuff in a 2 part mixture. Is it as simple as mixing the 2. then place the jighead on the silicone and repeat the next step in a couple hours?
Tim, as long as you spray some canola cooking spray on the set side of the silicon before you make the second half of the mould you will be OK. Vasoline is just as good but the cooking spray is better as it's an even very thin coverage and will prevent the 2 sides sticking together.
I am a dental technician by trade and we use all this sort of stuff everyday. The main key with it is to get the ratio correct, as with some brands, if you deviate from the ideal mix, you'll get surface imperfections you won't see until the final casting is finished, by which time it's usually too late and you will need to start again. Or, it will take too long to set and may warp.