Spongegloss is a gloss stored in a sparkly small pink bottle with a brush attached to the lid. It has a small non-shiny pink lid and the bottle is filled with Spongegloss, which is also pink, yet translucent. As the name suggests, it is made specifically for sponges.
Role in episode
SpongeBob applies it to himself to keep himself shiny and clean for school picture day, but it is soon washed off with water.
Role in Picture Day Disaster
Spongegloss can be used to prevent SpongeBob from getting dirty for a short period of time.