I have been repairing some windows but have noticed that the underside of one of the stone window sills is very flaky and damaged.
Therefore I wish to stabilise this, rebuild it and finally paint it.
Any ideas on exactly how I should go about this? I thought about brushing away as much of the loose material first then painting with something to hopefully stabilse and stop most of the flakyness.
Would this be suitable? (Stabilising Solution Concentrate)
Once the surface is reasonably sound, I then thought I'd use either concrete mix or external filler to rebuild the shape.
Finally sand off and paint.
Any comments on this?