Applying a coating over existing swimming pool tiles

When can a coating be applied directly over tiles?

Three conditions must be met. Firstly: 80% or more of the tiles must be firmly adhered to the substrate (verifiable via a tap test by the applicator). Secondly: there must be no active cracks or structural movements in the concrete shell. Thirdly: the glaze must be sufficiently roughened by blasting for mechanical adhesion.

If these three conditions are met, a renovation with a coating over tiles is not only possible but often the economically and technically best option.

PoolFIX Preparation Protocol

1. Visual inspection and tap test on all tiles. 2. Blasting of the entire tile surface (removes glaze and biofilm, creates mechanical adhesion profile). 3. Replacing or removing loose tiles. 4. Levelling joints, cavities, and unevenness with 2-component epoxy mortar. 5. Dust removal and application of adhesive primer if necessary. 6. Two coats of ACRATON® Dolphin coating in the desired colour.

Advantages over tile removal

No demolition costs, no disposal of tile debris, no intrusive work on the concrete shell. The lead time is 30% to 50% shorter, and downtime for the operator is limited to 2 to 4 weeks instead of 6 to 10 weeks. Furthermore, the original pool design (dimensions, slope, stair sections) remains unchanged.

When should tiles be removed first?

In cases of widespread tile detachment (more than 25–30% loose), the presence of structural cracks in the concrete shell, or continuous delamination beneath the tilework, complete or partial removal is necessary. PoolFIX advises in such cases based on a personal inspection.