Alkali Resistant Primer
A primer formulated to resist the high alkalinity of fresh cement render and provide a stable base for a topcoat.
On an actual building
Cementitious substrates are strongly alkaline for a long time after application. Without an alkali-resistant primer the topcoat is attacked from beneath and fails early.
What we most often have to correct
That priming is a way of stretching the topcoat. It is a functional barrier between two chemically incompatible layers.
Where this comes up in our work
Terms that come up alongside this one
- Saponification
The chemical breakdown of a coating by alkali, in which the binder reacts with alkaline salts in fresh cementitious substrates and loses cohesion..
- Primer
A preparatory coat applied to a substrate to seal it, improve adhesion and provide a compatible surface for the system that follows..
- Acrylic Coating
A water-based coating with good UV stability and colour retention, widely used as an exterior decorative and protective finish..
Alkali Resistant Primer — questions we get asked
What does alkali resistant primer mean in waterproofing?
A primer formulated to resist the high alkalinity of fresh cement render and provide a stable base for a topcoat.
Why does alkali resistant primer matter on a real project?
Cementitious substrates are strongly alkaline for a long time after application. Without an alkali-resistant primer the topcoat is attacked from beneath and fails early.
What do people commonly get wrong about alkali resistant primer?
That priming is a way of stretching the topcoat. It is a functional barrier between two chemically incompatible layers.
Have a building showing this?
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