It's quite expensive especially if you want to make a large mould. You can make your own silicon putty fairly cheaply.
Peter
DIY: Cheap and Easy Mold Putty - YouTube
Here's mine total cost £32.00.... should get eight 5 1/2 x 3/4 x 3/4 blanks from them. I had around 10 mins play time with the stuff before it started setting. Only wish I had known about the cornflower and silicone sealer before hand though
Don't sweat what has passed, it's worth having a go with the cornflower just so you get a feel for it, you can make moulds for specific kits.
Peter
It would appear pro made moulds are not so expensive by comparison.
Peter.
With the own made putty the same size mould should cost no more than around £3.00
Here's mine total cost £32.00.... should get eight 5 1/2 x 3/4 x 3/4 blanks from them. I had around 10 mins play time with the stuff before it started setting. Only wish I had known about the cornflower and silicone sealer before hand though
View attachment 29978
Try plain old bathroom sealant I use clear, make a former out of scrap wood, pump in the silicone work well in,
and smooth the top the top (now underside) with half a potato, silicone will not stick to it because of the starch,
leave to set for 48 hours and turn out. A load cheaper
and more working time. (will bring you some tomorrow)