The technology for protective coating has evolved
over a period of time depending upon substrate (Surface
to be coated; Metal, Nonmetal, Concrete, Stone, Wood
Etc.) properties of coating system and durability.
These days coating systems are designed which are
more envoirnment friendly. The technology is changing
very rapidly and every day new coating systems are
introduced in the world.
In India, Protective
coatings are broadly classified as paints. There are
cement base, Acrylic base, Epoxy base, Polyurethane
base Coatings available for Protecting the building/structure.
Selection of the right product is important. While
selecting a product certain parameters are required
to be considered include percentage of elongation
,dry film thickness, UV resistance, Resistance to
saline atmosphere and their chemical resistance. Resistance
to algae and fungi is also considered these days.
Cement base paints are
not flexible in nature and provide protection for
a shorter duration compared to Acrylic base &
Polyurethane base Coating system. Thus though cement
paints can paint the surface, they cannot be considered
in helping the waterproofing.
There are Acrylic base
systems available only for Protective Coating &
help to some extent in waterproofing. These painting
systems provide dry film thickness of 45 to 50 microns
and are not very elastic in nature. There are other
Acrylic base systems which are quite elastic (Elongation
more than 100%) and provide dry film system of 350
to 500 microns (0.35 to0.5mm) these systems are also
stabilized against Ultraviolet Radiation. These systems
can be considered for providing not only Protective
coating but also in waterproofing. Acrylic base systems
are water base systems & thus Eco-friendly in
Polyurethane base system
in comparision with Acrylic base systems provides
better degree of protection to Ultra violet Radiations
and also on account of their flexibility (Elongation
40%) help in waterproofing. these systems provide
dry film system of 80 to 90 microns. These systems
are solvent base systems.
systems either individually or in combination with
one another are used.