Made by Rhonda Ward
This is the project I’ve been working on for our experiment to see how Jonni’s cement paper mache holds up outdoors. I made three jacks out of styrofoam. The first two I covered with cement board joint tape, then one with the recipe without joint compound, the other with the recipe with joint compound. The third I’m applying the recipe with joint compound directly to the styrofoam. I tried both on small pieces, either recipe sticks to the styrofoam fine. I’ll post when I get them finished, but I thought someone may like to know that it works over styrofoam. The only other tip I’d like to add is screen (I used a flour sifter–haha) your portland cement, those little balls won’t break up in the mix.