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got an old house with rubble filled sandstone walls. The gable end wall has had a sealant sprayed on the external face before but it was a BQ type £20.00 for 5 litres stuff. Just wondered if I can use a stone floor sealant on the wall with a lifespan of at least a couple of years that is suitable for external use?
1 litre does 3-5m2 and cost around £60 for 1 US Gal.