Gypsum or cement plaster? How to choose plaster and skim coat
October 25, 2026
Plaster turns rough brick or concrete into a smooth wall ready for paint or tiles. The right type depends on where the wall is and how much moisture it gets.
Gypsum plaster
Gypsum plaster is light, quick to work and dries to a very smooth, white surface. It is the usual choice for interior walls and ceilings in dry rooms — living rooms, bedrooms, offices. It is not made for outdoor walls or rooms that stay wet.
Cement and lime-cement plaster
Cement-based plaster (render) is hard and resists water and frost. Use it outside, on plinths, in basements, garages and in bathrooms where tiles will go on top. Lime-cement plasters let the wall "breathe" better and are popular on older buildings.
Skim coat and finishing plaster
A skim coat (finishing plaster, stucco) is a thin final layer, usually a few millimetres, that fills small marks and gives a perfectly smooth surface before painting. It goes over a base plaster or over concrete and plasterboard.
Thickness and drying
- Every product states its minimum and maximum layer — thicker than that, apply in two coats.
- Drying takes longer in cold and humid weather. Do not paint or tile before the time on the data sheet.
- Prime very absorbent or very smooth substrates first so the plaster bonds well.
See our plasters and finishes — each product page shows where it can be used, the layer thickness, drying time and coverage per m².
Questions
Can I use gypsum plaster in a bathroom?
Not in wet zones such as showers. Use a cement-based plaster there, especially where tiles go on top.
Do I need a skim coat before painting?
For a smooth, professional finish, yes — a skim coat hides small marks and joints that paint alone would show.
