What I do with my plastisol is take a wire coat hanger, I open it all the way up and cut off the ends where it has been wound. I make a bend about 6 inches long and bring it back to the main wire. Then I take the main wire and make a 90° bend. That creates an L shaped wire with a double wire on the bottom. I put it in a drill and place it in the bottle and turn on the drill. It can be used to scrape the bottom and sides and does a heck of a mixing job.
I keep it right beside the plastisol jugs so it will always be handy.