Texmateria
Gypsum Plaster
A fine interior plaster based on gypsum. It sets smooth and crisp, accepts paint or ornament well, and has a softer, more absorbent surface than cement plaster.
Common names
- plaster skim
- hard plaster
- gypsum skim coat
- interior plaster
Search phrases
- smooth plaster wall
- old interior plaster
- white skim coat
- plaster ceiling
Common uses
- Interior walls
- Ceilings
- Repairs
- Moldings
- Paint substrates
Choosing points
- Best for interiors where smooth accurate white walls and ceilings are required.
- It is usually smoother and finer than cement render.
- Old plaster can crack in networks or around lath and substrate movement.
- Painted gypsum plaster may look like paint until chips reveal the white mineral layer.
How it ages
- Good indoors, but water quickly stains, softens, or damages gypsum-based plaster.
What to avoid
- Do not use gypsum plaster as-is outdoors or in wet rooms. Moisture breaks it down, so it needs a suitable substrate and waterproof finish.
