The designer needs gypsum to make or add corrections, or even to make a piece of land model or an object. There are workshops specializing in proportioning matrix for entire models but we have to manipulate models, modify the terrain, mark the streets, roads and later incorporate the edifice model.
In building models is preferable to use white gypsum. For homogenization, gypsum is required in a water container until it can not be absorbed. Continue to mix very well for 2 minutes. If the resultant gypsum is too rough, it can not be diluted by adding water (this mixture is not homogeneous). In this case, the process must be repeated, again mixing.
Coatings, lute and gypsum powder are drying out more slowly. Caution: a dry matrix absorbs the recently applied gypsum humidity with great rapidity to instantly solidify it.
To work with a gypsum matrix, it needs to get plenty of water with a sponge or sponge. The mix, once it has been created, can be separated from the die by means of a knife or cable without breaking it. Once the model has dried, it can be closed, punched, sanded, etc. Before covering any cracks, the gypsum must be dampened.
Covering cracks
Crack coatings (white powder obtained from cellulose) should be used in the same way as gypsum, even if we have to keep in mind that they tend to get tighter. That’s why it’s convenient, especially for covering imperfections and cracking. Totally contrary to what happens with gypsum, the material usually decreases when it dries.
Clay, plasticine
Clay (fine mud) and plasticine (blend of wax, pigment and stuffed products) are easy to model and are recyclable. We are used to concretizing the first ideas of a project through conceptual and working layout. Clay models must be protected with a plastic to prevent the drying process from being too rapid.
