We have a 200 year old cottage with cobble and brick walls and the rear has been painted with Sandtex to cover alterations and poorly done repairs.
One wall had previously been lime washed and the Sandtex is well bonded but it is flaky in places particularly on the brick pillars.
A second wall has Sandtex painted over the original cobbles (and mud!).
It has been recommended to us to paint the walls with silicate masonry paint, as it is breathable, to help prevent damp.
We contacted Earthborn who advised that the silicate masonry paint would not adhere to modern paint finishes and would need to be removed, they recommended a product called 'Peel away 7'.
We have spent a couple of days using a hot air stripper, scraping and a sample of Peel Away 7 with limited success.
The Sandtex came off the lime mortar on the wall that was not limewashed but adhered strongly to the flint cobbles. Peel Away 7 has softened the paint but it is not lifting off in strips as claimed.
We recognise that we may have to accept a compromise but as a last resort we are considering repainting with Sandtex :-(
We would welcome advice on the best way forward.