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Below is a sample of questions received on the subject of stabilising primers… White dust on stonework? I was doing same repair work prior to painting a couple of weeks ago, used the Toupret Ex filler , it's superb For larger areas of filler I roughly smoothed over, then again used the paintbrush to texture and blend in the filler. Just scraping over with a knife will leave a smooth area which will show through the paint
I would not normally advise painting since this is going to present yet another barrier to any trapped moisture evaporating away naturally without causing further damage. You may find that this process removes a lot of the loose particles on the surface, presenting you with a solid surface which can easily be primed with a thineed solution of masonry paint.
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Stabilises and hardens “friable” masonry or masonry surfaces which may have “gone soft” due to extreme weathering.
When you have removed as much loose material as possible, treat the worst affected areas with a stabilising solution which will bind any reaming loose martial, presenting you with a solid surface on which to paint. Only do this on the very worst affected areas though. One coat should normally be sufficient but very porous surfaces may require additional coats. Drying time will vary depending on the ambient temperature, but normally 4 – 8 hours should be allowed for each coat to fully dry. For the best results allow surfaces to cure for a minimum of 24 hours before applying the Weatherflex Smooth Masonry Paint. DO NOT apply when air or surface temperatures are below 8 °C. Would you recommend the use of sandtex stabilising solution as a primer to prevent the paint failure?? If this be the case then scrape off any loos paint, allow to dry out over a period of a few weeks and paint again. You may well find this is an ongoing process or it may be isolated to one or two problem areas.
Tools and equipment should be cleaned with warm soap and water immediately after use. Pump sprayers especially should be thoroughly flushed through with warm soapy water and then flushed with clean water until free of all residues. DO NOT allow to dry before cleaning.