- When built, Ōamaru Stone should be washed down, brushed clean and any areas which have discoloured with moss or mould should be treated with a moss or mould killer.
- When the stone is dry, it should be treated with a top quality water repellent silicone sealer.
- This treatment should be carried out as per manufacturer’s instructions, along with an exception that most water repellents require a cover of approximately 1 litre per 1 – 1.5 m2 on Ōamaru Stone, which has a greater absorbance than concrete.
- In normal circumstances correctly treated surfaces remain water resistant for up to 10 years.