Painting is the practice of applying paint, colour
to a surface. It is also an act or skill of using
paint as a decoration.
Good quality painting has attractive appearance,
last longer and gives you more value.
However, there are important factors you need to
consider when panting. I will call them guidelines
but it is illustrated in a problem solving format for your
easy understanding and get the best when painting.
[headline_arial_medium_left color=”#000000″]Problem Solving – During Painting are:[/headline_arial_medium_left]
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1.Paint not hiding the previous coating
Possible Causes:
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- Too much thinning of paint than desired.
- Previous paint-coating very dark and topcoat applied without primer-putty primer.
- Recommended number of coats of paint not applied.
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2. Poor coverage
Possible Causes:
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- Less thinning than recommended.
- Surface being painted is rough or not prepared as recommended.
- Applied more coats than needed.
- Poor quality of application tools.
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3. Dust/bittiness of new paintwork
Possible Causes:
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- Dust or dirt in the atmosphere settling on the surface during or after application.
- During surface preparation, the surface is not cleaned properly after sanding. Therefore loose particles may get mixed with the paint while application.
- Use of a dirty application tool.
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4. Poor gloss level and solvent based paints
Possible Causes:
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- Painting in cold and damp condition, that causes condensation on the newly painted surface.
- Use of incorrect solvent, contaminated solvent or solvent with traces of water.
- Application of paint in a poorly ventilated room.
- Lack of adherence to manufacturers recommendation for necessary gap between subsequent coats.
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5. Sagging/running of paint
Possible Causes:
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- Application of too thick paint coating at a time.
- Over dilution of paint.
- Application of paint on a very smooth surface(without sanding).
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6. Slow drying
Possible Causes:
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- Too thick application.
- High humidity and/or low temperature during paint application.
- Improper ventilation, Application being done in confined area.
- Use of contaminated/ improper thinner and not the recommended thinner.
- Lack of adherence to recommended dilution ratio.
- Recommended system usage not adhered to. For instance, not adding adequate hardener in a two pack system like Melamine, PU.
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7. Shade variation
Possible Causes:
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- Paint not thoroughly mixed prior to application.
- Application of very thin or thick coat over the surface.
- Use of light top coats over very deep undercoats.
- Use of colored or dirty thinner for thinning paint sample.
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8.Powdery or chalky surfaces
Possible Causes:
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- Over thinned paint applied on the surface.
- Highly porous and absorbent surface making film under bound.
- Paint film deteriorating due to action of sunlight, oxygen or salt in air in marine areas.
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9. Premature rusting or cracking of paint on metal surfaces
Possible Causes:
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- Too thin application.
- Improper undercoat application.
- Incorrect primer usage.
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10. Flaking of paint film
Possible Causes:
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- Substrate not dry -moisture beneath the paint film.
- Painting over rust results in little or no adhesion.
- Painting on an inadequately prepared surface.
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11. Dampness
Possible Causes:
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- Broken or defective plumbing or some other general building defect.
- Paint should not be applied until the source of dampness is addressed.
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12. Efflorence/blistering of walls
Possible Causes:
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- Moisture beneath the paint film can cause crystallisation of salt from building material such as bricks.
- Paint should not be applied until the efflorescence has ceased to appear and has been removed.
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13.Algae/Fungus Growth on Painted Surfaces
Possible Causes:
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- Algal/Fungal growths are most likely to occur in damp conditions or on surfaces with a high moisture content.
- Algae growth on exterior masonry can be a problem in sheltered environments that are in close proximity to trees and bushes.
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14.Brush Marks
Possible Causes:
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- Too thick application – paint not thinned as per recommendation.
- Application done on very rough surface or highly absorbing surface.
- Poor brush condition.
- Poor painter skill.
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15. Fading
Possible Causes:
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- Use of interior paint for exterior applications.
- Direct prolonged exposure of an interior surface to sunlight.
- Use of inappropriate colorants for creating shades.
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Your Friend,
F. Audu
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