Johnstone’s Trade Alkali Resisting Primer is a solvent-based, first-step coating for interior or exterior surfaces. It is perfect for use on new or bare plaster, rendering, blockwork / brickwork, concrete and cement.
Alkali Resisting Primer can be used as a primer on unpainted surfaces or as a sealer on powdery substrates, providing excellent resistance to alkali.
This Johnstone's Trade Primer is great for use under emulsion paints such as Johnstone's Trade Jonmat Premium Contract Matt.
For exterior masonry walls, try using Johnstone’s Trade Stormshield Stabilising Solution.
This primer is available ready mixed in White.