I’ve not used Avalon’s but have used one called Silicone Plastique here in the Uk sold by “The Cake Decorating Company” it’s not cheap, so have reverted to using Artista Soft air drying clay for small molds. It’s far cheaper…. around £50 for a big tub of silicone plastique … Artista Soft is around £6-£8 and you can make quite a few molds from it. I have to be honest though, its not as flexible as the silicone, but serves a purpose for small molds for limited use :) You can use cold porcelain too mixed with the artista soft to make it more flexible.
There are other makes of silicone palstique and I bought some in the USA last year that was cheaper, but not that much cheaper.
Here is Artista Soft link, but there are many suppliers so best to goggle to get a good price: http://www.windsorcakecraft.co.uk/artista_soft_standard_white_paste_200g.html?source=googlebase&kw=&fl=1000&ci=60449157310&network=pla&gclid=CILJ67fqocACFVMRtAodhRYAhQ
Here is link to The Cake Decorating Company (UK based but ship overseas) for the Silcone, again, shop around for the best price where you are: http://www.thecakedecoratingcompany.co.uk/catalog/product_info.php?products_id=4785
Cold Porcelain: http://www.windsorcakecraft.co.uk/products_search.php?search_string=modena&search=Go
you can also make your own cold porcelain: I use Alan Dunn’s from his books, but here is one I found :) http://www.craftmehappy.com/2013/09/making-cold-porcelain.html
I hope this is of some help or use?
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