A stabilising solution is a liquid product used to prepare porous or chalky masonry surfaces before painting with masonry paints. They penetrate deep into the surface, binding loose particles and creating a solid base for the paint to adhere to. This prevents the paint from peeling or flaking prematurely and extends the life of the paint job.

Stabilising solution should be used on chalky or powdery surfaces such as previously painted, weathered masonry surfaces prior to application of masonry paints. They can also be used on surfaces with slightly loose and flaking paint once the worst of it has been removed, as well as on very porous surfaces such as breeze block and concrete walls.

For sound, bare render surfaces a thinned coat (mist coat) of masonry paint is usually sufficient to seal the surface and stabiliser is not needed. Always follow the paint manufacturers instructions.