Should I use a primer before painting indoor floors?

Why primer improves adhesion and durability

Most indoor floor coating problems are caused by poor preparation rather than the paint itself. A primer helps by sealing porous areas, binding light dust and giving the paint a more uniform surface to grip. This is especially relevant on concrete, screed and repaired floors where absorption can vary from one patch to another.

Epoxyprimer is formulated to maximise adhesion between the substrate and epoxy floor coatings. It can be used on concrete, timber, ceramic tiles and screeds, which makes it a practical choice for many indoor projects.

Floors that benefit most from priming

Primer is most useful when the floor is not a single, consistent surface. You are likely to see a benefit in the following situations:

• Porous concrete or screed: uneven absorbency can draw paint away from the surface and leave weak or dull areas.
• Ceramic or quarry tiles: primer can improve the bond on smoother, less absorbent surfaces.
• Timber floors: priming helps reduce the risk of the topcoat lifting where grain or old finishes vary.
• Mixed-material or patched floors: primer evens out the difference between old and new sections.

Practical application notes

Epoxyprimer requires 24 to 48 hours to cure at room temperature before you apply the next coating. It can be applied by roller, brush or spatula, and coverage generally depends on how porous the substrate is.

For best results, make sure the floor is stable, clean and dry before priming. Once the primer has cured, you can move on to a hard-wearing indoor floor paint such as Prolux.