We have a nice pastel pink coloured pebbledash coating over the side of
our 1930's (solid brick - no cavity) house, and water seems to be
getting in to stain some of wallpaper inside. A bit early in diagnosis,
I need to rule off some other causes like guttering leaks and cracks in
brickwork, but as a treatment is the following expenditure generally
effective?

http://www.i-sells.co.uk/enviroseal-external-water-repellent-concentrate-ltrs-p-4048.html

To preserve the finish, I need something transparent ...

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Adrian C