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Finish Coat:
Concrete Surface
:
2 – 3 coats of Durocem
1 coat Robb Red Oxide Primer/ Zinc Chromate
Primer/ Zinc Phosphate Primer.
Steel Surface
2 coats of Robb. Aluminium paint or Robb. 
Super Gloss Synthetic Enamel.
040
DUCTING
An enclosed tube of circular or box section used to pass liquid or gaseous
matter from one area to another. Ducts are normally made of galvanized or mild
steel. Ducts are commonly used for carrying warm air throughout a building
heating system, for ventilation, air-conditioning or for carrying fumes or dusts
from manufacturing processes into the exterior atmosphere.
Painting:
G.I. Surfaces:
1 coat Wash Primer
1 coat Red Oxide Primer/ Zinc Chromate/ Zinc
                                                 Phosphate Primer                                                                  
2 coat Robb. Super Gloss Synthetic Enamel.
Steel Surfaces: 1 coat Zinc Chromate Primer/ Zinc Phosphate Primer
2 coat Robb. Super Gloss Synthetic Enamel