Dealing with defects by Nippon Paint

Many problems can occur during painting. Sometimes, they occur simultaneously. Understanding the causes of some of these defects can make the paint job easier.

Here are some common paint defects and their solutions:

Sagging - happens when the paint droops downward after being applied on the surface. It is caused by the pigment separating from the paint and settling at the bottom of the container and comes as a result of insufficient stirring or shaking during storage, storing for too long or under too much heat, or faulty thinning.

The solution:

Avoid storing in hot locations for long periods.
Store in accordance with the manufacturer's recommendations.
Thin only with appropriate recommended thinners.

Wrinkling - happens when the paint forms film-like undulating waves. Applying too much paint, or drying during high temperatures, or painting on a topcoat before the undercoat is dry can cause this defect to happen.

The solution

Avoid applying too much paint.
Make sure no paint accumulates round bolts, rivets, etc.
Wait until each coat dries before you re-coat.

Decolourisation - After paint is applied, it may fade or discolour. This is caused by particles in the wall reacting with the paint when it is drying. Decolourisation could also be caused by water seepage, or by contaminants in metal or wood.

The solution

Repair water seepage.
Make sure surface is dry before painting.
Apply an alkaline-resistant or oil-based paint.

The solution

Walls

Check and repair water seepage.
Ensure walls are dry before painting.
Use an alkali-resistant basecoat or sealer.
Patch surface defects with putty.

Wood

Prime wood before painting, sand surface and clean off dust.

Metal

Remove all paint from metal before re-painting. Prime surface and re-coat with suitable paint.

Chalking -

The solution

Remove any unstable paint films.
Allow wall to dry thoroughly, and repaint with recommended paint.
Make sure paint is not adulterated with foreign materials.

Blistering - This is caused by moisture being drawn through from the wall to the paint-wall interface.

The solution

Remove any unstable paint films. Allow wall to dry thoroughly, and repaint with recommended paint.

Algae/Fungus Growth - can grow when the surface is continually damp and dirty. Insufficient fungicide/ algaecide in the paint can also worsen the situation.

The solution

Remove algae / fungus by high-pressure washing.
Treat surface with Nippon Paint Fungicidal Wash. Wash again to remove any residue.
Allow wall to dry before applying with recommended paint.

The solution

Make sure the wall is completely dry before painting.

Blisters - Also caused by water seeping out of the wall surface. Peeling, efflorescence, and watermarks are also caused by high moisture content in the wall surface.

The solution

Make sure the wall is completely dry before painting.

occurs when ultraviolet rays cause the paint binder to disintegrate. It can happen when interior paints are used for exterior surfaces. Peeling - is caused by moisture on the wall, poor surface preparation or using the incorrect painting system. This defect happens on walls as well as wood or metal surfaces.