Cement plaster molds2/28/2024 ![]() They will provide ample thickness for the concrete planter walls. The walls will be too thin, so either the sour cream container needs to be wider or the Nilla wafers container needs to be narrower. These concrete mold containers are not sized appropriately to fit. The two containers should fit together allowing for spacing that is neither too narrow (causing cracking) or too thick (taking up too much space). The thickness of the walls has to be considered. If you are casting planters or dishes, you will need to find two molds that will be sized properly and fit inside of each other. ![]() In addition, another important consideration is finding the proper size inner mold to fit proportionately to the outer mold. The material to use for the mold will depend on size and in each section I discuss which materials are good for certain sizes. This also puts your cement crafts piece at risk of getting broken. Often concrete crafts can still be removed from a mold with an undercut, but you probably will have to cut or break the mold to remove your piece. The only way to get concrete out of this would be to cut it. If you were to try to demold this by turning it upside down, it wouldn’t come out. If the concrete can’t slide out easily because of a pocket within the mold, then you may have an issue. This is because complex shapes tend to have bevels that go in a direction that will cause an undercut. The complexity of a shape will matter as well. Tapered molds are good and will help with releasing concrete. Something with straight sides and something deeper will become increasingly more difficult to demold. The tapering of the sphere allows it to come out easily from the plastic. I have these plastic half-sphere molds that are made to be for bath bomb soaps.ĭemolding isn’t much of a problem because of the shape. *The more flexible the plastic is, the easier it will be to demold, so watch out for plastic containers that are rigid. If you’d like more detailed information, I’ve written a post about how to make concrete shiny. Silicone won’t produce a very shiny piece of cement, but it will be super smooth.Īnything with even the slightest bit of a matte feel or appearance will give you a matte result with your concrete/cement. The more glass-like the mold is, the shinier your cement craft will be.Įven though silicone is super smooth, it doesn’t have a glass-like feel or any sheen. You will need a smooth mold if you want a smooth look. ![]() The texture won’t affect whether or not your project is successful from a functional standpoint, but it does affect the aesthetics. Two other great articles are the Making Cement Crafts | Getting Started & Advanced Techniques & Tips, and also Concrete Crafts Pigment Tests – How To Color Concrete & Cement. ![]() There isn’t an ideal material for choosing a mold for concrete crafts because, aside from size and shape, there will be a few other factors to consider. Concrete won’t stick to silicone, rubber, or plastic. The best material for a concrete mold will be something that it won’t stick to. However, there are several considerations when choosing a mold for cement and concrete. The most common use will be a silicone mold for concrete.
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