Wednesday, February 1, 2012

How To Make Silicone Molds With A Deeper Cavity

Half of the work of making a silicone mold is being able to figure out what will make a good mold and what won't.

Items that are really detailed, or that have a lot of crevices that fold in on themselves, won't necessarily work as well as something that's flatter or smoother.

To demonstrate this, I used a little rabbit that's been hanging around on my mantle for a while. It was a good example of an item that's going to make a good mold, since it doesn't have any kind of parts that double-back over themselves.

It's also narrower at the top than it is at the bottom, so it should come out of the finished mold relatively easily. Additionally, the base is flat, so you don't have to worry about the bottom having a shape that needs to be molded.

To make the silicone, mix according to the directions...



Place the item that you're molding on a flat surface, and press the silicone around it, keeping the base pretty even with the item.





Turn the piece over and make sure that the mold is open at the bottom. In this case I had to kind of push the silicone away from the neck and the tail to make sure the rabbit would be able to come out of the mold when it cures.


For the spikes and the studs, I marked the items that I was using to make the shapes, then pressed the silicone into a rectangular shape that was deeper than the depth of the pieces that would be inserted.




I pressed the cone into the silicone up to the mark so that they'd all be the same depth. Then I re-inserted them carefully into each cavity to make sure the shape wasn't distorted.







(You could just make little spikes by hand, but this makes them all uniform...And if you use chocolate to make the shapes, they'll be really smooth and sharp.)
I did the same thing with the little pyramid, then pressed the silicone to make sure that the base of the pyramid shape would be square.


The materials that work best in deeper molds are a little stiffer, so gumpaste would work better than fondant, etc. It just makes it easier to pull the molded item out of the cavity.


I used some melted chocolate to fill these molds, then put them in the freezer for a while until they hardened up. I also tried it with gumpaste, and that worked fine. You'll probably have to trim the bottom edge of the shape after taking it out of the mold unless you're able to level off the material exactly with the cavity opening when you're filling it.

The melted chocolate gives you the best edges and the sharpest shapes, but you also have to make sure that the chocolate gets down into all of the mold. If it doesn't it can leave an air bubble that will ruin the shape. Fill it bit by bit, using a toothpick to spread the chocolate out in the mold cavity, then give the mold a good whack on the counter to try to dislodge any bubbles.


Next- Two-piece molds



 Kara Buntin owns A Cake To Remember LLC in Richmond VA, and cake supplies online at www.acaketoremember.com and www.acaketoremember.etsy.com

1 comment:

Canterbury Cakes said...

This is great! Thanks for sharing. I look forward to the next installment.