Construction: Painting tips
Article page |
Health page |
Fruits and Vegetables
House Plans |
House Loans |
| Interior Design |
Property Buying Tips |
Renting Tips |
Education | List of Colleges |
PU sealer, matt and glossy has to be mixed with
the hardener in the ratio 80:20 of base and hardener. The mixture is to be
allowed to mature for a minimum period of 30 minutes and should be used within 4
hours of mixing.
Melamine sealer, matt and glossy - has to be mixed with the hardener in the
ratio of 90:10 of base and hardener. The mixture is to be allowed to mature for
a minimum period of 30 minutes and should be used within 8 hours of mixing.
Melamine should not be exposed to ammonia vapour at the time of mixing or
application / drying.
Wood Stains can be used to give the required shade to the wooden surface. Wood
stains can be mixed with Melamine, but not with TouchWood or PU wood sealer /
finish. Wood stain is to be applied on raw wood before application of the clear
coat. Or it is to be applied over the sealer coat and before the top coat. The
wood stains are for interior usage only and will fade if applied on exterior
wood. Normal Putty which is used to smoothen out walls cannot to be used on
wood. The previous coat of finish has to be very thoroughly sanded for the new
The choice of application can be affected by the
type of finishes to be used. A finish formulated for compressed air spraying
could well be suitable for compressed air hot-spraying or airless spraying by
adjustment with thinner. Some types of finishes may be ill-suited to or
impracticable with a certain method of application, for example, some catalysed
finishes with "pot lives" of only few minutes would be a hazard in hot spraying
application. A good finishing system depends on having the right equipment,
materials and processing techniques, thus requiring co-operation between the
equipment supplier, the paint manufacturer and the user.
Horizontal surfaces like awnings, chajjas,
terrace borders, etc. should be given one additional coat for better protection
as these areas are prone to water accumulation.
No interior primer or putty or Plaster of Paris is to be applied under the
exterior finishes. Doing so will affect the performance of the paint.
New surfaces must be coated with one additional coat of self priming (1:1 by
volume) with water.
The cement coating has to be done within 2 hours of mixing with water. After the
coating and after 4 hours of drying, curing with water to be done 2 - 3 times a
day for one coat.
Darker shades may require an additional coat for
proper hiding. The actual shade, especially for darker shades, can be observed
only after the film is dry and not in the can or in the wet state.
Felt rolling is to be done only for Royale and Lustre finish. The darker shades
are never to be felt rolled since this will cause foaming due to presence of
more surfactants in them.
Solvent based paints (those using thinner other than water) should be given
twice as long a drying time than given here in case of high humidity climate
Putty can be applied to make the substrate smoother; however it has to be
sandwiched between 2 coats of primer.
Brushing is the oldest method of application having versatility under
unlimited variable conditions and situations. It is still the best method to
paint large complex objects. Brushing helps to assist in the penetration of the
paint. Wastage of the paint is relatively low. It is mainly used for decorative
and maintenance application.
Choice of Brush
The best quality of brushes are made up of hog bristles. These bristles
taper from the roof to the tip where each is split into two or more fine strands
known as flag, which enable a high degree of finish.
In cheaper brushes a proportion of other animal hair or vegetable fibres are
used. Brushes made up of nylon bristles are also available. These are superior
to pure bristles in their resistance to wear, but are smooth and non-absorbent.
Hence they carry less paint and have a tendency to run-off from the brush.
A brush of suitable size for the work at hand should always be selected. Using a
small brush on a large area makes it difficult to apply an even coating and
slows down rate of working; while using a large brush on a narrow area makes
accurate "cutting in" impossible.
Use and Maintenance of Brushes
In a new brush, bristles hold dust and broken bristles must be washed out
before using the brush for finish work. Soap water can be used for washing out
the new brushes. A paint brush works best when it is 'broken in' that is, when
it has acquired a level at the end of bristles. Brush must be 'washed in' in
order to distribute the paint throughout the thickness of the brush. Brush is
dipped in the paint and is rubbed against the sides of the kettle. After
painting is over, excess paint is brushed back into the container, the brush is
scrapped clean with a blunt putty knife, rubbed on a suitable surface, then
rinsed out in thinner and 'spun' dry. It should be thoroughly washed in soap
water and dried.
-At a time, the area to be painted has to be small, to facilitate the
distribution of paint without loss of time. Otherwise, brush marks are
-The pressure of the brush must be equal for all strokes so that the paint
easily penetrates to the surface.
-In order to ensure the levelling and elimination of brush marks, "laying off"
should be done with very less pressure.
Paints suitable for Brushing
Air drying type, based on long/medium oil length alkyds, emulsion, distemper
are ideal for brush application. Quick drying type paints based on medium to
short oil length alkyd and fast evaporating solvent like Xylene are not
At present hand rolling is done mainly for decorative and maintenance paintings.
Roller Coating application is of particular value on broad plain surfaces. The
covering material for the roller may be plastic sponge. When equipped with a
long handle extension, roller may be used for floor painting and work otherwise
For large areas it is more convenient to work from a bucket than a tray; a
perforated grid is placed inside the bucket, the roller being dipped into the
paint and then rolled over the grid to remove surplus material and distribute it
evenly. With the tray, a reservoir at an end holds the paint; after charging the
roller, it is rolled out on the platform of the tray. In use, the roller is
rolled over the surface in criss-cross strokes, working the material out evenly.
Paints normally used for brushing can be hand-rolled.
Although not as quick as spraying, it is usually quicker than brush
application, especially on rough surfaces. Another advantage is that, it enables
the semi-skilled operator to obtain a reasonable standard of finish and for this
reason, it is likely to be popular with amateur painters. Roller application on
narrow or broken surface does not show any special advantage over brushing.
Roller coating application is used virtually exclusively for coating metal
containers such as tins and also for some drums, kegs and barrels which can be
formed from the coated sheet.
The coating material is fed on the rubber roller through two smaller feed
rollers which are of precision ground iron or steel, and which are also
adjustable for pressure in order to regulate the film thickness of the coating.
The sheets pass between rollers, rubber covered roller and a metal backing
roller. After coating, the sheets pass through conveyor belt in the ovens and
Paints suitable for Roller Coating
They must have
-Excellent adhesion and flexibility.
-Excellent flow and application characteristics
-Adequate chemical resistance for the end use.
-A hard marproof film formation quality.
-Adequate intercoat adhesion between various coats.
The main features of this process are high product rates, minimum losses,
controlled film weight and thickness and economy.
Paint suitable for spraying
Normally paints are based on short oil alkyds and compositions based on fast
evaporating solvents like Xylene and NC Lacquer.
It operates on the principle of jet of fluid paint subjected to a stream of
air. The correct balance between air and paint is essential for atomization and
hence successful spraying. The system required for spray painting consists
essentially of a source of compressed air, filter for removing dirt, water and
oil, a container for the paint and a spray gun.
Guidelines and tips: To find a reliable Builder or
Guidelines & tips
before you start house construction
What is top-up housing loan ?
Home improvement tips:
Wallpaper for interiors
Benefits of rainwater
harvesting in homes
Tips & guidelines: Electricity Saving at home
Coming Up With Landscaping Ideas
How to set out a building on site
Interior design: The Rebirth of Wallpaper
Green Building ?
What is Domestic biogas plant ?
Why home insurance is very important in India?
How To Install a Home Wind Turbine
to get energy
How to Install Electric Wiring
Significance of Home Plumbing
Should I buy or rent? A simple calculation
Easy Landscaping Tips for Beginners
Buying a flat? Don't get carried away by the sample
30-storey hotel built in just 15
Is it worth buying an old
House plans, home plans, plans, residential plans
House Loans, home loans, where to get housing loan
How do loans work, the basic concepts of loans
Construction Tips, construction guide lines,
house rental tips, rental tips, renting properties
What is Reverse Mortgage
Guidelines to purchase residential properties
Lotus-shaped 91 feet prayer hall in kerala
What is Interior Design, interior desings, resources
Interior Design Colleges
Interior Design- Bed Rooms
Interior Design- Bath Rooms
Kitchen Designs, kitchens
Modern Architectural Design Softwares
Landscaping Designs landscape architectures