Application procedures may vary slightly depending upon site conditions. the general recommended guideline for the application of the bitumen coating system is as follows:
Surface preparation
The surface shall be cleaned thoroughly of all contaminants like dust, traces of curing compound, oil, grease. Light mechanical grinding/grit blasting/high pressure water jet may be used to clean the surface of all the contaminants depending on the degree of contamination on the surface to be coated. All surface imperfections and protrusions shall be removed and repaired. Structurally unsound and friable concrete must be removed and repaired with a suitable Polycrete* concrete repair mortar.
Priming
It is highly recommended to apply a priming coat prior to the application of the Polycoat RBE 1000 coating on the substrate. The primer can be prepared in the site by diluting Polycoat RBE 1000 with 20% water and applying this diluted coat as the primer. For very dry and porous substrates apply two coats of this primer. The primer can be applied to damp or freshly cast concrete surfaces also. However, it should not be applied on waterlogged or flowing water areas. In case of delay in application of the top coat for more than 24 hours, a fresh coat of primer shall be re-applied.
Foundation
Waterproofing Stir the contents of the drum thoroughly before application to remove all sediments. Depending on the dry film thickness required, apply the jellified emulsion @1–2m²/L/ coat at required no. coats. 2nd coat or Subsequent coats shall be applied only after the previous coat dries off completely and shall be applied at right angles to the previous coat. Clean dry sand may be broadcasted onto the wet coating to provide a key for the subsequent coats and achieve a greater dry film thickness. If a plaster or cement render is to be applied on the bitumen coated surface, broadcast clean, dry sand over the primer caoting whilst it is in wet condition. Care shall be taken to ensure that the first coat is not punctured during the application of the second coat. However, if the coating is damaged, the area can be readily over coated provided the surface preparation is done properly.
Protection
Polycoat RBE 1000 coating should be protected from getting damaged due to the ongoing site activities. coating can be protected either by a cement sand screed (50mm thick) or by an asphaltic protection board (Bituboard*). Alternatively, a 1000 gauge polythene sheet can also be used for protecting the coating in areas where the backfill material is not very coarse.
COVERAGE
The coating shall be applied at a coverage rate of 1-2m2/ L/coat at required no. of coats and may vary depending on the requirement.
