Why is my painted surface not smooth/ Why do I see foreign particles/bits on the painted surface
Paint film containing particles of paint particles, skin or foreign matter, which will be appearing above the surface of the paint film shows a rough appearance. This also called as seeding of paint.
What are the possible causes?
May due to contaminated paint.
Due to paint skin or gelled materials.
Surface may be dusty with foreign matter
Contaminated roller, brush or spray gun.
Dusty working environment.
Poor quality of application tools (brush or roller).
How can I fix the problem?
Remove the paint using appropriate thinner
Make sure the surface is free from dust & foreign matters.
Use new uncontaminated paint
Use cleaned or new brush, roller.
Why does the paint film look dull in colour and gloss
Hazy appearance on the paint surface reassembling a bloom, which will shows as dull in colour & low gloss.
What are the possible causes?
Paint film may expose to moisture.
Amine blush in epoxy coatings at low temperature.
In-correct solvent blending.
Substrate may contaminate with moisture.
High humidity environment condition.
How can I fix the problem?
Remove the bloom with suitable solvent cleaner.
Apply suitable undercoat and finish coat.
Use correct paint system recommended paint manufacturer.
Application under the controlled environment condition.
Why does the painted surface have multiple cracks resembling dried mud
Irregular deep cracks found on the dried paint film resembles as mud cracks.
What are the possible causes?
Paint applied too thick.
To cover poor hiding, building up thickness of paint.
Adhesion of the coating is insufficient to bear the stress.
How can I fix the problem?
Remove the paint by scrap.
Sanding the surface to smooth before repainting.
Use correct paint system recommended paint manufacturer.
Why do I see blisters in the paint film
Dome shaped projections or blisters in the dry paint film through local loss of adhesion from the underlying surface. Blisters may contain liquid, gas or crystals.
What are the possible causes?
Localised loss of adhesion due to contamination with oil, trapped moisture, rust or salt.
Wet sanding operations (particularly with polyester based products) without sufficient time to allow water to evaporate before application of top-coats.
Blisters can occur in many sizes, patterns and frequency and can form between individual layers or beneath the entire film build.
How can I fix the problem?
Thoroughly clean the areas to be painted with clean water.
Consider changing to dry sand operations to avoid water absorption when sanding.
Allow sufficient time for water to evaporate when wet sanding happening
Why are there spots of corrosion/rust on a newly painted surface
Spots of corrosion on the surface of the newly painted surface due to industrial fall outs.
What are the possible causes?
Iron particles which falls on top of the surface which oxide the attack the paint film.
Industrial fallout which damages the paint film can cause the corrosion spots.
Spark damages due to welding or grinding operations..
How can I fix the problem?
Immediate removal of metal particles.
During welding or grinding work ensure that the painted area covered & protected..
Why is the painted surface have wrinkles similar to an orange peel
Sprayed paint film in which the surface of the paint film resembles the skin of an orange.
What are the possible causes?
Failure of paint film to flow-out due to in-correct pressure, or wrong solvent blend and poor application technique.
High Viscosity, wrong spray nozzle selection low pressure (poor atomization).
Spray gun is too far away from the object.
How can I fix the problem?
Adjust the paint viscosity with the recommended thinner by paint supplier.
Keep the spray gun within the recommended distance.
Use the recommended pressure and nozzle type.
Why is paint peeling off from the surface
Peeling tends to be associated with soft and pliable fresh coatings which can be pulled away from or spontaneously flake away from the substrate or from between coats, due to loss of adhesion..
What are the possible causes?
Peeling is the reduction in bond strength of the paint film due to contamination or incompatibility of coats.
Condensation of substrate due to temperature changes.
Excessive moisture due to high humidity.
How can I fix the problem?
Scrap all the loose paint from the substrate.
Clean and degrease the substrate and make sure it is free from contamination.
Use the suitable primer followed by recommended top coat.
Why is there a powdery substance on the paint film which rubs off on my hand
Powderly layer on top of the paint film, which is disintegration of paint binder due weathering / UV light.
What are the possible causes?
Decomposition of binding agent at the paint surface resulting the release of pigments.
Poor repair work on the previously chalked paint surface.
Wrong selection of paint system.
Paint may diluted too much.
How can I fix the problem?
Remove all powdery deposits by wiping, scrubbing, high pressure washing or abrasion. Wipe loose material off and apply a chalk resistant topcoat.
Always keep to the recommended film thickness and number of coats.
Why are there small depressions/holes on the paint film
Formation of small bowl shaped depressions in the paint film. Not to be confused with Cissing.
What are the possible causes?
Shaking a partially filled can of paint will generate more foam.
Applying paint too rapidly especially rolling
Paint has insufficient time to flow into a uniform film.
Excessively rolling or brushing the paint
How can I fix the problem?
Avoid air entrapment during mixing.
For dilution, use the suitable thinner and recommended quantity.
To repair, clean the surface by sanding and recoat.
Why does the colour on the painted surface look uneven
Patchy finishes generally occur when there is not enough paint applied or the paint is applied unevenly, resulting in a variation of the film build hence a variation in appearance.
What are the possible causes?
Variations in surface gloss can cause applied paint to appear patchy
Paint applied over joint compound (putty) not fully dried.
Primer coat may not applied on puttied surface.
How can I fix the problem?
Increase the amount of paint on the roller or brush to allow better distribution.
Allow the joint compound (putty) to dry, before primer application.
Apply the paint in a grid fashion to ensure an even finish.
Why is there a white or powdery substance on some areas of my wall
White (powdery) substance on the substrate of concrete, brick, masonry and plaster. The efflorescence, which comes from the migration of salts, can lift the paint from the substrate.
What are the possible causes?
Soluble salts within the substrate. Moisture brings the salts to the surface of the substrate resulting in coating shows the efflorescence appearance and adhesion failure.
Excess moisture entrapped in the substrate will escape through the wall.
Insufficient curing of new concrete cement wall.
How can I fix the problem?
Remove all powdery substances and thoroughly clean the surface.
Ensure surface is moisture free, clean and suitable for application.
Remove or eliminate the source of moisture.
Apply a suitable sealer and coating system formulated for concrete, masonry etc.
Why are there black/green spots on my walls
Mildew is both interior and exterior problem found in damp areas receiving little or no sunlight. Mould often grows in areas where condensation forms from water vapour in the air meeting a cold surface which turns the vapour into a liquid.
What are the possible causes?
Failure to treat existing mildew before painting.
Failing to apply primer coat before top-coat.
Painting over a substrate or coating from which mildew has not been removed.
How can I fix the problem?
Treat the surface with fungicidal wash.
Use high pressure water wash to remove loose microbes, surface contaminants etc.
Allow the surface to dry completely before repainting..
Why is the paint film not sticking to the surface
Paint fails to adhere to substrate or underlying coats of paint. Loss of adhesion can manifest itself in two different ways.
Total lack of adhesion occurs below the entire paint film.
Lack of adhesion occurs between coats.
What are the possible causes?
Surface contamination or condensation, incompatibility between coating systems.
Poor surface preparation and poor drying condition.
For 2-pack products, wrong mixing ratio of base & hardener.
Diluting the primer thereby weakening its ability to stick to the surface.
How can I fix the problem?
Depends upon the extent of adhesion failure. Removal of defective areas will be necessary prior to adequate preparation and application of correct coating system.
Ensure that the surface is clean, dry and free from contaminants before painting.
Always use suitable primer followed by top coat as recommended by paint supplier.
Do not apply the paint too thick.
Why does the paint film not cover the underlying surface/old paint work
Substrate showing through the top-coat. Old paintwork, spot primer are visible through the top-coat
What are the possible causes?
Paint diluted beyond the recommendation.
Base coat darker shade than top coat.
Painting on absorbent substrate also shows poo hiding.
Paint may not stir uniformly before application.
How can I fix the problem?
Stir sample thoroughly before application
Apply primer coat followed by top coat, if the base colour is darker.
Use thinner recommended by paint supplier.(Don’t over dilute it)
Apply recommended film thickness with correct tools.
Why does it look like the paint on the surface is sagging
Downward movement and tears of paint which appear soon after application to vertical surfaces. In severe situations it may be described as curtains.
What are the possible causes?
Excessive application of paint.
Too much dilution of paint.
Poor application technique or poor workmanship.
Airless spray with gun too close to the substrate.
How can I fix the problem?
If sagging paint has dried, sand the surface, clean and repaint.
Do not dilute the paint more than the recommendation.
