Goop Posted On Sunday, October 28, 2012 Goop 2 packets of cornflour 2 cups water colouring large container Mix water and colouring into cornflour. The gloop should be thick. Add water if necessary (becomes sticky and slimy). Add a Comment Cancel replyYou must be logged in to post a comment. This site uses Akismet to reduce spam. Learn how your comment data is processed.