Sandtex masonry paint is designed to be a self-priming, all-in-one exterior coating, so in many cases it does not require a separate primer when applied to sound, previously painted masonry surfaces.
However, a primer or stabilising solution may still be needed in certain situations, such as:
- On new or bare masonry (e.g. fresh render or plaster)
- On highly porous or chalky surfaces
- On areas where the existing surface is flaking, dusty, or unstable
- When treating problem areas affected by damp or contamination
Always check the specific Sandtex product instructions, as preparation requirements can vary slightly between different masonry paint formulations.