Johnson's 'Future' (Klear in some countries) is an acrylic floor polish, used mainly as a gloss clear coat varnish in modelling. It's applied to the paintwork to facilitate the decal process, which should be laid down on a gloss surface. There are a number of other uses, and there's a post somewhere here in the modelling section, entitled 'The Complete Future' IIRC, covering the whole story.