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I have a paved patio which has stone or concrete slabs and in need of protection from stains and general annual growth. Can you advise what is the best product in your range to use?
If you are uncertain whether the flags are stone or concrete I would recommend using our Stone and Slate Protector (link below), this will be ok to use on either surface.
No you need to remove all weeds before sealing
I can be very dificult to remove sealer from walls etc.. so if this is something you wish to avoid, the best thing is to mask off the area before sealing. The only way to remove sealer is with solvent but no guarantee it will remove all.
It will help to reduce the weeds as the sealer will make it much more diifcult for weeds and mould to get a foothold, Ideally the drive will need to be kept clean and free from dirt where weed seeds will try to germinate