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I will need to buy the Concrete and Block Paving Sealer SP, and also the Stone and Slate sealer. As these contain solvents etc. are these dangerous to pets?
They can only cause an issue whilst drying, once it is dry its fine, usually not much more than 2 hours (depending on the weather).
But unless they walk over it as you are actually applying the seal it will only cause a little bit of irritation to the pads, nothing that would require treatment.
Drew Palin