If you want to start making concrete castings at home there are a ton of great options to get you started. You can buy kits of mold making rubber from Smooth-On and these are fantastic but very expensive.

Urethane is probably the most common one used for concrete castings because of how durable it is. If you only want to make a small amount of casting rubber, you can mix silicone with corn starch (a few tablespoons per tube of silicone should do).

Plastic bowls are the next item that you should have for doing the easiest DIY concrete castings at home; ideally you find sets of large bowls and small bowls.

Latex can be used for smaller or fine detailed concrete casting pieces but the inability to build thickness with latex makes it less desirable than silicone or urethane based mold making rubbers.

00:00 - Introduction
00:24 - Professionals use urethane to make molds
00:57 - DIY silicone molds
02:06 - Molds from plastic bowls
02:56 - Modeling clay for your own casting designs

How to Make a Silicone Mold for concrete Casting - [ Ссылка ]

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