Stick-Ons were released in 1986 after the 2nd U.S. GPK series
and during the start of the 3rd series GPK. Imperial Toy Corporation,
the same company that manufactured the 1st and 2nd series Sticker Album, also
came out with a series of Stick-Ons and Stick-On Pictures for the 1st and
2nd series GPK sets. The Stick-On Pictures had the same look as the larger
GPK wall plaques. These type of stickers, often called "Puffy Stickers",
were very popular in the 80's.