Aliphatic alcohol is an evaporation retarder. It is a surface film applied to freshly placed concrete to slow the rate of moisture loss from the surface during finishing operations. When concrete is placed in hot, dry, or windy conditions, surface water can evaporate faster than bleed water rises. This imbalance can cause the surface to dry out and shrink prematurely, resulting in plastic shrinkage cracking — fine cracks that appear before the concrete sets. It is critical that application occurs prior to any cracking.

To prevent this, the evaporation retarder should be lightly misted over the surface as soon as finishing begins — typically after screeding and bull-floating, once bleed water sheen has dissipated but before the concrete starts to set. The key is timing: it must be applied before any visible cracking occurs, as retarders are preventative, not corrective. If applied too late, they will not close existing cracks or restore lost moisture.

The retarder creates a temporary monomolecular film that reduces the evaporation rate by up to 80%, helping the surface remain workable for longer and minimizing the risk of crusting or tearing during troweling.

Reapplication may be required if finishing operations are prolonged or if wind and temperature increase. The retarder does not interfere with curing compounds and can be safely re-applied during finishing without affecting bond or appearance.