Flakes cracks and blisters FAQs

Flakes cracks and blisters FAQs


What causes flaking and blistering of paint on exterior brick and masonry surfaces?

  • The most common causes are moisture beneath the paint film and paint applied over dirt, oil, grease or onto a poorly prepared, powdery surface. Water-based coatings may blister if applied over surfaces previously painted with solvent-based paints or primed with a solvent-based stabilising primer that isn't thinned prior to application. To remedy the problem, scrape back all poorly adhering coating to a firm edge and abrade shiny surfaces with abrasive paper. If a solvent-based masonry paint or gloss finish was previously applied, repaint with either Dulux Trade Weathershield All Seasons Masonry Paint or Weathershield Maximum Exposure Smooth Masonry Paint.


What is the best way to deal with cracks in plaster?

  • It is quite normal for small cracks to appear in plaster on interior walls and ceilings, either through drying out in new homes or movement of the building in older homes. Simply cut out the cracks, dust off and fill with a suitable Polycell Trade interior filler. Allow to dry, then rub down smooth and dust off to create a clean, smooth surface for decorating. To ensure even porosity spot prime with a thinned coat of your finish.

I decorated my windows with a woodstain a year ago, but it is peeling off the putty, which is dry and cracked. Why is this?

  • The use of linseed oil putty for glazing in conjunction with Sikkens woodstains is not recommended.

    Putty contains drying oils which are necessary in order for the compound to remain pliable. These oils migrate into the timber and oxidise with the atmosphere unless the compound is sealed by a film-forming system, such as a traditional gloss paint.

    Sikkens systems are moisture vapour permeable, and therefore do not seal the glazing compound. The resulting loss of the oils allows the glazing compound to dry and crack, causing a failure of the glazing seal. For this reason we recommend the use of approved elastomeric sealants (polysulphide, silicone or acrylic).


Why does dry paint sometimes look like cracked mud?

  • It has most likely been caused by applying a thick, heavy coat of un-thinned paint to a textured or embossed surface. 'Mud cracking' can also be caused when the air temperature drops rapidly after applying a water-based product, or when over coating an emulsion without leaving sufficient drying time. The solution? Applying one or two thin coats will sometimes fill the cracks. Otherwise the best solution is to strip the surface, repaper and paint.

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