Could you tell me what clear tar gel is just started painting with oil and acrylic on canvas?

i have bought a pack of paints and with it was gel mediums cleare tar gel transparent gel. what is it used for and how do i use it .Could you tell me what clear tar gel is just started painting with oil and acrylic on canvas?
It is used to form raised shapes in acrylic or oil paintings. Tar gel is usually very thick and viscous. This link is to an art supply house I use frequently. It takes you to the description of the gel and it's uses.





http://www.danielsmith.com/search.aspCould you tell me what clear tar gel is just started painting with oil and acrylic on canvas?
Because signals are easily receved near towers.