Using Rebound 25 and Thi-Vex to Make a Small Concrete Casting
I created a new Fast Face this week. This time it turned into a slightly grumpy bulldog. If you’ve had a chance to read my new book you know I made my little bulldog by following suggestions I found in a lump of clay. The part of his face that I didn’t change at all was the mouth and muzzle. There was a suggestion of a nose on the clay, but it was a triangle, so I gave him a dog nose instead. There were lumps for ears, but I moved them around. The ears were made quite thick because concrete doesn’t work well for really thin, delicate forms.
Rex told me he’d like to make some Fast Faces to put out in the garden, and I think that’s a great idea. The molds are a little expensive for just one casting, but when your neighbors see them they’ll probably want some, too. Making duplicates will only take a few minutes because you already have the mold, and the new casting will cost about a nickel. The castings can be painted with acrylic or latex paint, but I really like the natural color of concrete.
Plaster of Paris is easier to use than concrete, but you can’t leave a plaster sculpture outside. When you go to the DIY store for your cement, tell the clerk you’d like a product that contains Portland cement and can be used in a mold. If you get a blank look, mention stepping stones. As I mentioned in the video, I lost the label for the brand of cement I used for my bulldog, but the brand doesn’t really matter.
It would be nice to use a product that sets up faster, though. That way, if the first one doesn’t come out quite right you can make another one without spending so much time waiting for the cement to get hard. One brand that sets faster is Quikrete. You can find it at most Lowes and Home Depot stores here in the US. A 50 pound bag costs about $5, and that will make a lot of castings. The silicone is expensive, but both cement and plaster are really cheap.
The Smooth-On website has tutorials for the Rebound 25 brushable silicone mold material here. I didn’t follow all their instructions because I wanted to save money.
If you’d prefer to purchase the Rebound 25 and Thi-Vex from Amazon instead of directly from the Smooth-On company, you can find them here.