i use the AG vinyl and rubber care on my tyres, its the same `milky` looking product as the AG tyre shine but seems to be more shiny. i apply it by squirting it onto a small brush then paint it on the tyre and i cant comment on it lasting as i put it on every week and dont travel too far.
It doesnt seem cause a kind of greay build up on the tyres like some ive used in the past