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Painting Problems and Solutions
What is it?
- Crazing is a network of fine cracks, usually in a hexagonal pattern, which measure between 5 and 75 mm across each hexagon. They are usually very fine and shallow and do not extend through the whole depth of the plaster and are thus classed as non structural cracks. ISO/SABS define a hairline crack as one with a width of 0.5mm or less. Cracks larger than 0.5mm is generally a true substrate crack. Generally craze cracks are stable and do not open and close with time.
Possible Causes
- Crazing is usually the result of over trowelling a rich mix (high cement content) or using sand containing an excessive amount of dust.
- Plaster that is allowed to dry to quickly due to sun, wind, absorbent brickwork and or badly graded sand.
- Plaster applied in layers that are too thick.
How Can I Fix This Problem
- Most sheens and medium build texture coatings can handle hairline cracks.If necessarily, glass fiber tissue can be applied during the painting operation.
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