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023
CORRUGATED IRON SHEET
  
[See Galvanized iron Sheet]
025
CAST PLASTER
(See “Plasters” also)
Painting:
2 coats of Plastron Sealer. 
2 coats of Acrylic Plastic Emulsion 
or Luxury Silk 
or Robb. Acrylic Distemper SPD 
025
CEILING
Ceiling does not need to be washed but for this cheap white wash or a coat with
whiting & glue should not be used since this will create problem if someone
wants to switch over to emulsion based paintings. 
Surface preparation:
 
If whiting/ lime wash is already there, wash off as far as possible by thorough
scrubbing. Allow plaster to dry completely. 
Painting:
Apply 2 coats of SPD
or 2 coats of Acrylic Plastic Emulsion. 
.
026
CEMENT BASED PAINTS
(Surfaces previously painted with) 
Cement based paints tend to become brittle when several applications build up
into a thick film and then age. The surface then tends to fracture forming fine
cracks, which allow rainwater to penetrate. This loosens paint adjacent to the
cracks, resulting in lifting and flaking. In addition, the adhesion between old coat
can weaken to the extent that the surface can not support further paint
application. Hence, there is often a risk when over coating old cement based
paints unless the preparations are very thorough. In certain cases the only safe
answer is to completely remove the old coating back to a sound surface. 
Surface Preparation: 
Scrap off all defective, loose and flaked coatings as well as surface
contamination. Brush down with stiff wire/ coir brushes to remove any remaining