Conformal coating is a thin coating to protect the board and traces from moisture and provides minor mechanical protection. The hot glue is used to tie the larger components together mechanically to protect the solder joints and traces from shock loads.
-Dan
"Capitalization is the difference between helping your Uncle Jack off a horse, and helping your uncle jack off a horse." "'she' also likes to swap since I think I am going to need to give her to woody again." - Dvlhntr "full alphabetic boost mode" - ChristopherTheOne " Purrs like a sexually satisfied black panther." - BigTDogg "Two oil eating, angry, spinning triangles of death." - turtleboy on rotary engines