As technology has advanced, we've seen new materials arriving on the market which can be used for making concrete molds.If making concrete molds, please realize that the material you should choose depends largely on what sort of creation you have in mind, and also on its size. Latex molds, for example, have become immensely popular simply because latex is so incredibly easy to use. There's no mixing involved, and there's no special preparation involved. In fact, the latex you buy is ready to use immediately, and this is why it's the option of choice for so many people. However, if you're an impatient person, then it may not be the ideal choice for you, considering that it generally takes a relatively long time to set. In other words, if you're using latex for your molds then you'll need to make the mold a day or two before you intend using it. Something else which is worthwhile noting is that latex molds have a tendency to shrink. Even though the amount of shrinkage is negligible, it may pose to be a problem depending on your personal requirements and what you intend using the mold for. After latex, polysulfide rubber is the next most popular material for making concrete molds In fact, if it wasn't for the bad smell, I wouldn't be surprised if more people chose to use polysulfide rubber rather than latex. Let's just say that the smell is bad enough to make you want to hold your breath; but then again, I wouldn't really say it's unbearable (like asphalt is, yuck). For heavy-grade molds, you want to use timber, or even steel to make your concrete molds; but again, it all boils down to what you intend on making. As discussed earlier, latex and polysulfide rubber are undoubtedly the most popular materials being used nowadays. Not only are they both very versatile, they're also very affordable. Below are links to specific types of concrete form If you should have any questions regarding concrete molds, please don't hesitate to shoot me an email. I'd be happy to help you. Molding Concrete Pavers Using Concrete Paver Forms Concrete Fence Molds Meet-Mr-Concrete.com provides concrete construction advice at no charge and in good faith for consideration only. We do not warrant the implementation of its content and are to be held harmless when and if any advice or ideas provided are utilized. The risk from using it lies entirely with the user. 
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