Characteristics of idael paint
constituent of oil paint
Types of paint
iron and steel surfaces
Defects in paints
Paint perform the following function:
1. It protects wood from decaying effect.
2. It prevents corrosion in metals.
3. It protects the surface from harmful effects of
4. It gives decorative and attractive appearance to
5. It renders surfaces hygienically safe and clean.
CHARACTERISTICS OF AN IDEAL PAINT
1. The paint should be cheap.
2. It should be easy and harmless to the user.
3. The painted surface should dry neither too slowly
nor two rapidly.
4. It should retain its original colour for a long time.
5. When applied the paint should from a thin
uniform film on the painted surface.
CONSTITUENTS OF AN OIL PAINT
An oil paint essentially consists of the following
1. A base.
2. An inert extender or filler.
3. A vehicle or carrier.
4. A drier.
5. A thinner.
6. A colouring pigment.
Good brushes should only be used for painting
work. Old brushes do not apply paint uniformly on
the surface. The brushes having good bristle only
should be used. Bristle brushes are elastic and
have good paint holding capacity.
This is actually first coat of the paint whose main
function is to fill the pores of wooden surface by
penetrating into the surface. It also acts as the
foundation for subsequent coats of the paint. The
priming coat is generally applied before fixing wood
The process consist of filling up all nails holes,
cracks , open joints, dents and other depression on
the surface by putty. Putty is prepared by kneeding
white chalk powder. Putty should be given same
It is modern method of applying paint on the
surface. For this spray gun or pistol is used. The
pistol works under compressed air and throws a
spray of paint.
PAINTING THE SURFACE OF NEW WOOD WORK
1.Wood work should be properly seasoned
2.After having cleaned, the surface is knotted
3.Now apply priming coat
4.When priming coat becomes dry,the surface is stopped
5.Under coatings are applied
6.Finishing coat is applied
PAINTING IRON & STEEL SURFACES
Surface is rubbed with wire brushes to remove rust
Sufrace should be washed with caustic soda or lime water to
remove grease spot.
A priming coat of iron oxide paint of red lead paint should be
applied on cleaned surface.
Now, two or more coats of paints applied.
PAINTING PLASTERED SURFACE
At least,6 or 12 months should be allowed to dry the plastered
To paint freshly plastered surface , alkali resistant primer paint
should be applied.
Spot showing efflorescence should be brushed off.
Oil paint, silika paint , emulsion paint & cement paint mostly