What is the best way to: How can I glue moss inside of a picture frame?

OPTIONS:
a). With a cooled hot glue gun place the tip of the glue gun where you like the glue pull the trigger and move the glue gun across the surface until there is enough glue on the surface then attach your moss to the surface.
b). With a heated hot glue gun place the tip of the glue gun where you like the glue pull the trigger and move the glue gun across the surface until there is enough glue on the surface then attach your moss to the surface.
Answer:
b).