Swimming pool copings can be sealed in the same way as all natural stone paving materials, always make sure your paving is completely dry before sealing and that you have at least 24 hours of dry weather ahead after sealing has been completed. With swimming pool areas more care is needed not to spill the sealant into the water as it could upset the chemical balance in the water, or at least sit on the surface of the water requiring additional cleaning of the pool before use. Always read and follow the manufacturers instruction fully when using any sealant products, and ensure you do a small test area first to make sure you are happy with the final finish before sealing the whole patio.