Reasons for Paint Peeling
Excessive dampness because of various reasons in walls can cause a high degree of efflorescence on plaster surface between paint and plaster (especially with new structures). If this process is very active, the pores in paint get clogged up and cannot function as a breathable membrane anymore. (Saltpeter in bricks or in plaster sand).
Walls developing a damp problem, previously painted with a non-breathable primer or paint and afterwards painted with BreatheCoat will not solve the problem because the wall is sealed off with non-breathable paint and the moisture build up will push off all paint including BreatheCoat on top.
Bad Plaster Work
Sub-standard strength of plasterwork (rendering) usually is a problem and results in the top layer crumbling or powdering and the paint no longer has a key (grip).
Softer or weaker patches in plaster (not well mixed) will cause different ratios of absorption of paint. Too, weak plasterwork absorbs all the water out of paint mixtures which leaves too little moisture on top for a proper curing process of paint.
The habit of plasterers to apply dry cement on too wet patches on plasterwork causes very hard spots, very dense with different ratio of absorption (hydration) or too little to adhere properly.
Too Much Water
Wrong quantities of water added to dry powder will affect the strength and quality of paint.
Not allowing the mixture to stand for 30 minutes will influence the proper cross- linking of content. If it is very cold use lukewarm water to mix the powder.
Strength Of Paint
Paint applied on a hot day and wall facing the sun without spraying the plasterwork before painting with a fine mist spray will also affect strength of paint. To assist curing even after painting, a fine mist spray should be applied 2 or 3 times on hot days for stronger curing. NB spray from bottom to top.
Unsealed parapet walls and cavities without drainage slots and subsequent water build-up will cause fungi to grow on walls.
Salt & Chlorine
The peeling of paint can also be ascribed to too high levels of sodium and chloride in substrata.
Not having enough paint on a paint roller or brush to render the correct thickness of paint and applying too much pressure on roller (roll out too dry) can have an adverse affect on the quality of paintwork.
Excessive plaster-cracks should be treated before painting.
Left over paint
Paint mixed and not used on the same day, cant be used on the following day, because the binding strength is reduced