Pre-exposure prophylaxis (or PrEP) is when people at very high risk for HIV take HIV medicines daily to lower their chances of getting infected. PrEP can stop HIV from taking hold and spreading throughout your body.
In the dry plaster or fresco secco technique, pigments are usually mixed with water, although other substances might also be used. The paint is then applied to a dry plaster wall which has been wetted down with water. Since the plaster is relatively dry, it is non-absorbent, and the pigment adheres to the surface of the plaster. This technique differs from true fresco (described below) in several ways. The colors tend to flake off the surface of the plaster.
Plaster can be defined as a mixture of lime and sand or cement and water that is applied over walls and ceilings on top of lath, to form a smooth hard surface that can be painted over once dry. Depending on the type of plaster, strength and durability may range once the coat is applied.