Figure 2. Depiction (ESEM) of a section of gypsum plaster with primer (substrate removed!). Top: Transition area containing primer became denser. Gypsum/primer 10 to 20 μm (primer 1 Betokontakt). Bottom: Clear denseness of transition area containing primer. Gypsum/primer 15 to 60 μm (primer 2 Quarzgrund)