Author: rainbow

Blistering is usually caused by the evaporation of trapped moisture or solvent. If surfaces are painted shortly after washing down, even if time is allowed for surface drying, blistering may occur as a result of moisture absorbed into the old paint. Painting in the direct heat of the sun may result in rapid “Skin Drying” causing solvent to be trapped in the film. Recoating before the previous coat is hard may cause blistering for the same reason.

Possible Causes:

• Applying oil-based or alkyd paint over a damp or wet surface.
• Moisture seeping into the home through the exterior walls (less likely with acrylic paint).
• Exposure of acrylic paint film to high humidity or moisture shortly after paint has dried, especially if there was inadequate surface preparation.

Solution:

• Open all the blisters and leave the entire surface to dry.
• Sand the surface to obtain a smooth surface
• Spot prime with Rainbow Fresh Plaster Primer over the affected areas.
• Apply the selected topcoat. – (Rainbow Exterior Paint, Long Life Acrylic or Weather Shield Paint

Undesirable sticking together of two painted surfaces when pressed together (e.g., a door sticking to the door frame).

Possible Causes:

Not allowing sufficient drying time for the coating before closing doors or windows. • Use of low quality semi gloss or gloss paints.

Solution:

• Use Rainbow Eggshell or Gloss Paint.
• Low quality acrylic paints can have poor block resistance, especially in warm, damp conditions.
• Follow instructions on product packaging regarding dry times.
• Pure acrylic paints generally have better early block resistance then oil-based paints; however, alkyds develop superior block resistance over time.
• Application of talcum powder can relieve persistent blocking.

Increase in gloss or sheen of paint film when subjected to rubbing, scrubbing or having an object brush up against it.

Possible Causes:

1. Use of matt paint in highly trafficked areas, where a higher sheen level would be desirable.
2. Frequent washing and spot cleaning.
3. Objects (furniture, for example) rubbing against the walls.
4. Use of lower grades of paint with poor stain and scrub resistance 5. Washing the painted surface with cleaning product containing ammonia.

Solution

1. Paint heavy wear areas that require regular cleaning (e.g., doors, window sills and trim) with a top quality washable product like Rainbow Long life Acrylic Sheen, because this type of paint offers both durability and easier cleaning capability.
2. In high traffic areas, choose Rainbow Eggshell or Gloss Paint rather than a matt finish.
3. Clean painted surfaces with a soft cloth or sponge and General Purpose cleaner; rinse with clean water.