Could anybody please advise how to create isomalt 12 x 12 inch clear glass-like slab with regular borders? I tried to make a small one pouring clear isomalt on my silicon mat, but it was full of bubbles. How to achieve equal thickness and regular straight borders? Thanks in advance for any replies!

I don't have any ideas about the bubbles, but if you need to make a form to hold the shape of your product while it cools, I'd suggest the following:

http://www.goldaskitchen.com/merchant.ihtml?pid=3694&step=4

I keep some on hand for those times when I need a specific size or shape of cutter NOW and no way to order it. You just bend it to the shape and size needed (in your case a 12 x 12 square), use the special tape (included) to join the ends together, heat it in the oven for a few minutes to set the bond, and voila!

Thanks cakeyouverymuch! It's awesome. I've seen this product when searching for something to make custom cookie cutters, sadly it's out of my reach (living in Europe). Do you think any type of aluminium stripes could be used? Don't know about double-faced tape though - what to use if it's going to the oven? Thanks again.

I'm sure pretty much any type of aluminium would work. Do you have access to disposable aluminium roasting pans? You could cut strips from the bottom of one of those. I'd cut the strips double wide (say 1 inch (2-3 cm)) and fold them in half to give them greater strength. I'd use the folded edge as the "bottom" as it would be more straight and sit flush with your working surface. As to joining the the ends, if you cannot access heat activated double sided tape (which is what comes with the kit) I'd just cut my foil a bit longer and make a fold at each end. You'd have to fold one end "in" and one end "out". Then I'd just hook the two ends into each other and crimp it tight with a pair of pliers. Once you've filled it with the poured isomalt, the pressure from the inside should keep the ends from coming apart.

You are a genius! I bet you are a DIY girl (me too ). Thank you soooo much!

Another option you might look into is cake rings. If you are going to need this mold for other projects in the future it might be worth the expense to see if you can find a square cake ring in the appropriate size.

As to the DIY, I'm forced to it by a lack of patience. Why wait for the shops to open on Monday when you have an idea, a bit of this and bit of that and a hardware store just down the street that's open on the weekend? By the time the shops open on Monday, the cake's been baked, decorated, and eaten for Sunday dessert and I'm the possessor of a hand made tool that I can use next time.

Let us know how it all turns out.

Use straight pieces of metal of any kind to form the square. Think metal rulers, any lengths of metal from a DIY shop etc... For the bubbles you need to run a blow torch over the top of the isomalt, should get rid of them. HTH

Unfortunately, I live in a Neanderthal cake decorating era country (could be defined so) - no cake drums, boxes, colors, no cake decorating supply shops, VERY limited choice of scrapbook supplies, gift paper, ribbons - you name it... we don't have it. Even a local (and the only one) DIY shop is a disaster. So, even if I go there on Monday, I'll not find anything.

Thanks Lisa and Deb for all your help. The isomalt slab will be for a Christmas cake project. If it turns out how I'd like it to be, I'll post a photo and let you know! Thanks again and good caking (or isomalting )