Dulux Avista® Surface Retarder is a ready to use water-based retarder which is used on freshly laid concrete to reveal the aggregate content of the mix. It turns blue on application to the surface and can be washed off from 3-24 hours after application.
Cleaning materials
Water - Other - Spray equipment should be cleaned immediately after use with hot water.
Application Tools
Air Spray, Airless Spray
Approval test - always pre test on a small section to determine the appearance achieved. This is particularly important with finer aggregates such as 6mm and 9mm and with concretes with accelerated set additives such as calcium chloride, heated or steam cured concretes, etc.
Proper curing of exposed aggregate surface is essential for maximum strength development. High temperatures will reduce retardation and high cement contents will also reduce retardation. When retardation has finished, concrete will cure to its full strength.
It's important to expose aggregate earlier in warmer or windy conditions, so not to incur an early set making wash off difficult.
