POLYPUR WC 40

Description

Multi component polyurethane resin based intermediate wear coat

 

Polypur WC 40 is a multi component high quality elastomeric intermediate polyurethane resin based wearing coat for car park deck coating system. Polypur WC 40 is designed to provide a flexible and crack bridging waterproofing coating for highly trafficked areas.

Properties

  • Flexible. Excellent crack bridging capability
  • Resistant to water and vapor
  • Good chemical resistance
  • Can be applied on various substrates and also on cured epoxy coatings
  • Available in different colors
  • Easy to apply

This TDS is applicable for the United Arab Emirates only. Please contact your local Polybit sales office for the available TDS in your region

Step by Step

Surface preparation

The surface should be dry, free of any cement laitance, oil and grease, curing compound and any other contaminants, which may affect the bonding. Light mechanical scabbling, grit/captive blasting or grinding is recommended for cleaning the surface of such contaminants. New concrete surfaces should be 28 days old and the moisture content on the surface must be less than 5%. Refurbishment of existing or old floors must be done with a suitable repair mortar, in order to ensure that the bond between the old substrate and the new flooring system is very good. Surface irregularities and blow holes shall be repaired with Polypoxy BF* (Epoxy resin based blow hole filler and skimming mortar) or Ceresit RS 88* (cementitious repair mortar). Alternatively an epoxy resin based scratch coat can be used when repairing larger areas (> 0.5m2). The surface after carrying out the necessary cleaning shall be vacuumed for removing the dust debris left over after the cleaning process.

Priming

Prime the prepared surface with Polyprime PU* @4-5 m2/L. The coating is applied when the primer is dry. However, in all circumstances, the coating shall be applied within 24 hours of application of the primer. If the primer surface is left open for more than 24 hours, then a fresh coat of primer has to be re-applied. Broadcast Aggregate No. 3 on the primer whilst it is still wet @0.3 kg/m2. After the primer dries off, brush away or vacuum out the excess aggregates.

Intermediate Wear Coat

Polypur WC 40 shall be applied as the intermediate wear coat. This coating is supplied in three pre-weighed packs (resin, hardener and filler). Take a suitable container and pour the resin (A) into it. Add the hardener (B) into the resin and mix thoroughly with a proprietary paddle mixer fitted to a slow speed drill for 2 -3 minutes, until a homogenous consistency is obtained. Slowly pour the part C (filler) into the mixing vessel and further mix for 2-3 minutes. Work the mixer round the mixing vessel to ensure it scrapes the side and bottom of the pail. Once the material is mixed properly, pour the material onto the primed surface and spread it evenly with a notched trowel. Once the material is evenly spread, use a spike roller to take out the entrapped air. Stop spiking as soon as the coating starts to gel. Whilst the wear coat is still wet, broadcast Aggregate No. 3@ approx 2-4 kg/m2 (depending on the wear coat thickness). Allow to cure for 24 hours after which excess aggregates should be brushed away. 

Top Coat

An abrasion resistant top coat is recommended to be applied on top of the wear coat to protect the surface from mechanical damage. For internal covered areas, Polypur TC 10* (polyurethane resin based coating) and for external exposed areas, Polypur TC 20* (UV stable polyurethane coating) shall be applied as the abrasion resistant, hard wearing top coat. Allow the coated system to cure for 7 days, after which it can be subjected to heavy traffic.