I don't know who else has tried Armor All Shield 'Even better than a wax' but forget Sonax that has been beading water for a month or so, this product has beaded on my car for almost three months. It says it will stay active for up to ten washes and sure enough I can vouch for it.
I found it on the Auto Express website after they did wax and polish reviews and this one won in 2013:
http://www.autoexpress.co.uk/accessories...group-test

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