To make relief murals, a model has been dug up and is going to be filled with cement. What cement do you need? How to allocate? What should I pay attention to?

Ordinary cement will do, and sand should do. Depending on how far you want to go. Cement and sand 1 2, the ash number should not be too large, otherwise it is easy to crack. Just make your own water and add accelerator to save time. Spread a layer first, then add a screen, and then another layer. Don't waste time in the meantime. Take out the cement when it is dry. Don't forget to put away what you want to install.