Can I Apply Liquid Primer Over Old or Tiled Floors?

← Back to Liquid Primer for Flooring

Liquid floor primers can be applied over old flooring and ceramic tiles once the surface is clean, abraded, and stable. Primers improve adhesion between the existing substrate and a new resin coating, reducing the risk of delamination. The best results come from removing loose material, contaminants, and gloss before application. Suitable primer systems include water-based epoxy primers and other flooring-grade options designed for mixed substrates.

Can I Apply Liquid Primer Over Old or Tiled Floors?

If you are working over glossy tiles or an older screed, preparation is the step that determines whether the primer will hold. The guide below covers what to check, how to prepare the surface, and which products are suited to this situation.

Preparing old and tiled floors

Primer can bond to existing tiles and older substrates, but only when the surface is prepared correctly. Glossy ceramic tiles need mechanical abrasion to give the primer a key. Old floors should be checked for movement, cracks, damp, and loose patches before any coating goes down.

If the existing surface is unstable or crumbling, primer alone will not fix it. Repair or stabilise the substrate first.

Surface preparation steps

The basic preparation process comes down to removing contaminants, creating a key, and checking the floor is solid.

Clean thoroughly: Remove dust, grease, wax, old adhesive residues, and anything that could block adhesion.
Abrade the surface: For ceramic tiles, use a diamond grinder or coarse abrasive pad to remove gloss. For old concrete or screed, remove laitance and weak material.
Check stability: Tap around for hollow tiles or loose screed. Secure or replace loose areas before priming.
Allow the floor to dry: Primer application works best on a dry, dust-free surface.

These steps help the primer grip the old surface rather than sitting on top of it.

When this matters

Preparation matters most on glossy ceramic tiles, floors that have held a previous coating, and areas with heavy foot traffic. If the old surface is not properly abraded or cleaned, the primer may lose adhesion and the new floor coating could fail prematurely.

For these applications, choose a flooring primer that is explicitly suitable for tiles and old substrates. A universal water-based epoxy primer like Epoxyprimer is formulated for concrete, tiles, screed, and timber after preparation.