Sugru: a silicone molding compound for hacking around the house

""" Dow Corning® 795 Silicone Building Sealant is a one-part, cold-applied, non-sagging silicone material that cures to a medium modulus silicone rubber upon exposure to atmospheric moisture. """

Don't know the exact details of Sugru's formulation. But per the data sheet this stuff sets up to be a relatively stiff non-tacky surface in three hours and comes in a variety of colors.

You can buy variants at your local home improvement store. It's usually sold as silicone caulk.

That is not the demographic that orders random puttys from the UK in anticipation of perhaps needing it someday. To be successful in that demographic, it needs to be marked through traditional means, and it needs to be available at the store. That is expensive and difficult. Making a website and some Youtube videos is much easier, and less likely to be a financial problem if there is no interest.