Polyurea HM

Instructions for use

Substrate preparation
Substrate preparation is essential; therefore, the surface to be treated must be free from any contaminants, dry, sound, and have a tensile strength of at least 1.5 MPa. In all cases, the floor surface must be prepared by milling, shot-blasting, grinding or sanding, depending on the type of surface.
Any free-standing or standing water originating from the substrate, previous washing operations or weather conditions must be removed or dried using appropriate methods.
On porous substrates, the reactivity of the material and the resulting heat build-up could lead to the formation of through-holes in the coating due to the heating of air trapped within the surface. It is therefore advisable to ensure, after applying the primer, that the surface is effectively sealed (saturated).

Primer
Preparation varies depending on the surface to be treated:
– Concrete surfaces: shot-blast, then skim-coat with EPOX GRIP mixed with 0.1–0.3 mm quartz. For highly porous surfaces, apply a double skim-coat.
– Fresh resin: dust with quartz sand to improve the product’s adhesion. On damp surfaces or where there is counter-pressure, apply RASOEPOXY until a dry surface is achieved, then apply a further coat and dust with quartz.
– On heavily corrugated areas, the surface can be levelled by skimming with RASOEPOXY, adding 0.1–0.3 mm or 0.1–0.5 mm quartz to adjust both the thickness and consistency of the product.
– Metal surfaces: dry-blast in accordance with SSPC-SP10 to Sa2^.5 grade and coat immediately with POLYUREA HM.
– To create surfaces with a certain degree of slip resistance, immediately after applying the first coat of POLYUREA HM, rotate the spray gun so that it is parallel to the surface to be treated, keep the nozzle pointing upwards and move the arm in a sweeping motion to create a ‘shower’ of POLYUREA HM.

Product preparation and application
A two-component product, applicable using a high-pressure bi-mixer airless sprayer, preferably PLC-controlled for dosing and flow rate, fitted with a suitable mixing gun for polyurea systems (in-gun reaction). Optimal performance is achieved by spraying the product at a temperature of 70–80°C and a pressure of 180–200 bar.
The equipment must be fitted with in-line heaters, heated tanks and hoses.
The components of POLYUREA HM must not be contaminated with any chemical agents (solvents, oils, water or anything else) as this would seriously compromise the product’s characteristics.

When exposed to UV rays, POLYUREA HM may exhibit colour changes and slight chalking, without this affecting its mechanical properties.
To prevent such changes, protection with an aliphatic polyurethane such as POLYUREA FINISH is required.

Storage

When kept in its original sealed packaging, stored in a dry, protected place at a temperature between +5°C and +35°C, the product has a shelf life of 12 months.
Do not store the product at temperatures below 6°C.

Warnings

• Do not apply POLYUREA HM to substrates contaminated with oil, grease or general dirt.
• Do not apply POLYUREA HM to substrates that have not been previously cleaned and primed.
• Do not apply POLYUREA HM to substrates subject to rising damp.
• In all cases where the residual moisture content of the substrate exceeds 4%, a primer for damp substrates, such as EPOX GRIP, must be used.