DNA wroteمعجونة is Gypsum Plaster basically plaster
Not at all. Gypsum-based plaster is what we call جفصين . Clay-based plaster is called طين . Both are used in ورقة .
Primer is a type of sealing undercoat that is applied on porous and permeable substrates, such as plasters, concrete, woods, metals, and plastics, to prepare them for painting. A primer is a suspension of solvents and resin with high mineral content. It's very thick and putty-like, hence why it's called معجونة . Sometimes it's called أساس which is not wrong since it forms a base for paint, but أساس also means "substrate" which is the surface to be painted. In common parlance we say بدّي معجن سيّارتي but we don't say بدّي أسّس سيّارتي .