October 24th, 2018 | Sealers
What is the best sealer for Limestone exterior walling?
When applying a penetrating sealer to Limestone exterior walling, you are first and foremost requiring water repellency. There are good options for this in both water and solvent-based options. The 4 best products for this application are:
Limestone is typically very porous. However vertical surfaces tend to accept less sealer. Probably around 1Lt per 4m2 / application. If the area to be treated is large it would be wise to do a trial few square metres to better assess coverage.
Two applications is standard, but three may be required if the surface is very porous.
Best results will be obtained using Tile & Grout Power (dilute 1:60). Use Chlorosan for any mould or discoloured areas which remain. Ensure that the surface is rinsed very well after cleaning. Walls should be left for 24 – 48 hours between cleaning and sealing.