Weather & Temperature
Painting can only be carried out in fine, dry weather with little wind.
After being sprayed onto the macadam surface the paint dries to the stage where it is touch dry, and at this stage it starts its initial curing.

This can take between one and twelve hours, depending on temperature, humidity and air movement. Air movement is by far the most important factor in controlling the curing time.

Painting should only be undertaken when the temperature of the surface to be coated is > 5°C (40°F) and is likely to remain so for a minimum of six to seven hours.

A water based paint film will actually cure at temperatures as low as 0°C, though it will take an unacceptably long time to cure at such low temperatures. (Solvent based Polyurethane will not cure at < 5°C)

It is important to remember that the temperature of the ground affects the curing of the paint and that it should be the ground temperature that is measured not the air temperature - many sunny autumn days have an air temperature above 10°C or 15°C whilst the ground temperature (and therefore the film temperature) remains at 2°C or 3°C.

As a rule of thumb spraying is normally only undertaken during the period of British Summer Time.

Work during dry periods may also be prevented if there is a threat of overnight frost which damages the coating if it occurs during 24 hours of application.

Programming work in the UK climate is therefore very difficult and delays can occur. It is very helpful if the client can allow flexibility with access & working times. During periods of unsettled weather we will communicate if delays are probable.

Method of Application
The application of paint or binders is by Airless Spray technique. Pressures will depend on many factors but will typically be between 2,500 and 5,500 psi. The tip size should be carefully selected to ensure correct atomisation of the coating (28 thou. being typical) and the spray fan should be uniform with a feathered edge so that there are minimal discernible lines on the painted surface.

Two coats of paint should be applied in different directions to ensure an even finish with no patches. On Kids Zones up to three coats of paint are normally required to produce the vivid colours required.

Time Taken for Application
In good weather painting a standard court is achieved in a day. Where there is more than one court we may increase the manpower and number of spray guns to achieve this in 1-2 days.

During unsettled weather, two or more visits are commonplace to finish the courts.

Paint Curing Period
On completion of painting, the paint surface will be touch dry. The period of time necessary for the paint to fully harden is dependent on the ambient temperature.

Play can usually occur after 3 days but in low temperatures this can take up to 5 days.