I have done it two ways. I got a zipper from the fabric store and pressed it into gumpaste and then let it dry so I had a mold. Then I pressed my fondant in it, had to put a little cornstarch in it so it wouldn't stick but came out perfect. I have also when in a hurry just rolled out fondant and pressed the zipper into it and then just cut it out, walla a zipper! It's actually a reverse image but looks fine.
I have done it two ways. I got a zipper from the fabric store and pressed it into gumpaste and then let it dry so I had a mold. Then I pressed my fondant in it, had to put a little cornstarch in it so it wouldn't stick but came out perfect. I have also when in a hurry just rolled out fondant and pressed the zipper into it and then just cut it out, walla a zipper! It's actually a reverse image but looks fine.
Nice tips. Thanks. I was going to use silicone but this gumpaste mold sounds great too!
I make them free hand. It's actually really easy. Make a small rope, flatten it out then use the little white Wilton tool that has 3 cutting heads (sorry not sure of the name) - one is a zig zag which makes a great zipper look. Then using rectangles, ovals and another rope piece I build the zipper piece. Takes about 5 minutes but comes out great every time and doesn't cost anything 
I have also when in a hurry just rolled out fondant and pressed the zipper into it and then just cut it out, walla a zipper! It's actually a reverse image but looks fine.
I did this before and it worked great...you can see it here: http://cakecentral.com/gallery/1557011/leopard-tote-bag?sub=1557015
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