On Fri, 20 May 2005 15:08:17 +0100, Zak wrote:

But won't the water-based gums or wallpaper paste just DISSOLVE if
they are left to soak for a minute or so in water from the windscreen
washer?

Commercially printed no parking stickers are glazed on the upper
surface, often as part of the brightly coloured surface / print process.
This glaze is fairly impervious.

Gum is better because it dries more quickly. Wallpaper paste is
probably still wett (and peelable) when they return.