A tradesman has recently worked on a penetrating damp problem I had in a Victorian sandstone house. The damp was caused by a leaking gutter. He stopped the leak, removed the perished surface sandstone and pointing and treated the surface with a silicone spray. He only re-pointed part of the wall (high up where the leak was landing), stating that there is no need to replace the rest as the silicone treatment is enough protection. He did quote to 'remove and replace perished pointing'.
Is this correct or should he replace the pointing?