· Michael Blair
Stamped concrete gives the look of stone or brick at a fraction of the cost and without the weeds and settling that come with pavers. It is not maintenance free — the colour and the sealer are consumables.
Why resealing matters
The colour lives in the top few millimetres, applied as a hardener and a release agent. The sealer protects it from UV and abrasion, and Middle Tennessee sun works on it hard.
Once the sealer is gone, the colour goes next, and recolouring is a much bigger job than resealing would have been.
How often, and with what
Roughly every two to three years here, sooner on a fully exposed south-facing patio and later on a shaded one. The signal is the surface losing its slight sheen and water no longer beading.
Use a sealer compatible with what is already on it. Solvent-based over water-based, or vice versa, can cloud or lift.
- Reseal every two to three years, by condition not calendar
- Clean thoroughly and let dry fully before sealing
- Match the sealer chemistry to what is already there
- Two thin coats rather than one heavy one
- Add a grit additive on steps and pool surrounds
The slipperiness problem
Sealed stamped concrete is slippery when wet, and around a pool or on steps that is a genuine hazard. A fine polymer grit added to the sealer solves it without changing the appearance much.
It is easy to add during resealing and impossible to add afterwards without redoing the coat.
What goes wrong
Sealer applied too thick or over damp concrete traps moisture and turns white. It has to be stripped and redone, which is far more work than doing it correctly.
The other common failure is pressure washing at high pressure, which strips sealer unevenly and can erode the coloured layer beneath.