Under Bound Surfaces

Cause

Flaking is due to the underlying material being under bound Material which in case is old distemper

Solution

Complete removal of all the coating should be removed back to a sound surface.

Patch repair and painting is not advisable.

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Crows footing

Cause

Problems of this type occur when coatings, particularly water based paints are applied onto a surface which has a higher sheen level resulting in the adhesion quality of the newly applied paint being low, for example a matt emulsion being applied over a vinyl silk or an oil based coating.

It can also occur when water based paints are applied to new plaster without being thinned as a sealer coat.  This can result in the VOC’s (Volatile Organic Compound) being quickly absorbed into the surface resulting in poor adhesion of the coating.  Consequently, as the newly applied paint hardens the tensile strength of the newly applied paint film begins to shrink and cracks in the paint film appear.

Solution

After rubbing down and face filling with a fine plaster filler, applying a paint coating of a higher sheen level will in most cases overcome the problem.

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Crinkling

Cause

Softening of a previously applied coating caused by applying a subsequent coat before the underlying paint film is totally dry. Problems of this nature can also be as a result of applying paints such as chlorinated rubber which contain strong solvents over alkyd based paint finishes.

This type of problem can also occur when water based coatings are applied over an oil based sealer such as Alkali Resisting Primer or Stabilising Solutions for use onto a powdery substrate. And where the sealer coat has remained glossy and not flatted down before applying the top water based coats..

Solution

Occasionally it may be possible to remove the ridges. In severe cases complete removal may be necessary before re – painting can take place.

See Rivelling

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Ropiness

Cause

Ropiness of a paint coating caused by the material being high in viscosity (thick), with very little flow. This also occurs when paints of normal viscosity are applied without care.

Solution

The ‘ropy’ finish must be thoroughly dry and flatted down with carborundum paper (wet or dry) used wet, with water as a lubricant. If repainting with the same product adjust with appropriate thinning agent to the correct viscosity before re–painting.

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Cratering

Cause

Problems of this nature can be caused by rain falling onto the semi dried coating or  aeration/frothing of the paint during application usually by roller and not flowing out properly. Also referred to as pin holes

Solution

Once the coating is completely through dry, flatting down should take place using carborundum (wet or dry) abrasive paper preferably wet – using water/soap  or white spirit as a lubricant. Recoat with chosen paint finish.

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Cheesiness

Cause

A term relating to a freshly applied coating which, when dry, is mechanically weak. This can be as a result of the coating being applied too thickly, incorrect solvent used or  wax / grease on the surface which has not been removed before painting. Attention should always be given when painting doors architraves, particularly the lock side, as body fats can be deposited on the surface.

Solution

The coating should be removed and the surface thoroughly washed and flatted down with fine wet or dry carborundum paper. Solvent may be used as a lubricant and cutting agent then repaint as required.

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Cause

General loss of gloss caused by moisture or gases coming in contact with the wet or semi-set film during drying. This is particularly noticeable on exterior surfaces such as window sills when the work has been completed late in the afternoon or early evening, when the ambient temperature falls, and dew comes in contact with the surface. Internally, in areas such as kitchens or bathrooms when there is an increase in humidity, i.e. steam before the coating dries.

Also see: Chalking.

 Remedy

Flat down and re-paint with a further coat of gloss.

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Cause

This defect mirrors that of an orange peel and is generally due to incorrect paint application by spray or roller.

Remedy

The dry paint film should be flatted down back to a  smooth and level surface.  Wet or dry carborundum paper, preferably wet, is generally used.

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Cause

This can occur not only in paint which has been stored for a long time but also in relatively new material, i.e. hard or soft settlement.

Remedy

Thoroughly stir the product and ensure the settled pigment/solids are fully dispersed into the material. Although stirring with a palette knife (broad knife) will generally suffice, mechanical mixing or high speed paint shakers. may be preferred.

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Cause

This defect is caused by a paint coating being applied to a surface which has been contaminated with oil, grease, or polish causing the wet film to creep back exposing the underlying surface. This type of problem can also occur when coatings are applied to surfaces which have previously been treated with a silicone based product, contaminated with body fats including hair sprays etc. In extreme cases where the coating flows back from a large area of the surface, the term crawling is sometime used.

Solution

Once the coating has completely dried and the general adhesion is satisfactory, thoroughly flat down to a smooth surface

using wet or dry carborundum paper wet. After rinsing and ensuring the surface is free from all contaminates re-paint as required.

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