There are two surface installation techniques: 1) spray surface 2) Handcast surface 

1)Spray surface means that the surface layer is installed by mixing PU and EPDM rubber granules and then spray onto the cushion layer with a spay machine.  2)Handcast surface or known as broadcast surface is carried out by firstly paving the two component PU and then spreading the EPDM rubber granules onto the PU. Features: 
The full PU running track is a type of in-situ system running track, and it mainly consists of two layers: bottom cushion layer and surface top layer. It’s installed by paving the viscous liquid compound to the base, either concrete or asphalt. 

Full PU Running Track Layer Structure

 As this type of surface is impermeable to water it relies on a certain drainage slope to keep the running surface free of standing water. Such surfaces are strong and durable, provided they are correctly formulated using compatible raw material ingredients, properly mixed and installed under satisfactory environmental conditions.

Installation Process:
The installation of the thickness of this solid track system is controlled by the height of screed bars. 
For the handcast surface, the liquid resin mix is given a textured finish by broadcasting specially formulated coloured EPDM rubber granules on to the surface and allowing the the polyurethane to cure. Following cure, the excess surfacing granules are removed.
In terms of spray surface, the surface texture is formed by spraying the mixture of the coloured EPDM rubber granules and PU resins with a high pressure spray machine. By spraying, the surface of the track is more wear resistant compared to handcast surface.