How can I effectively adhere things to scratchboard? I want to glue cut-out pieces from a shiny silvery Bristol board onto scratch art paper (or scratchboard). I also want to adhere flowers (I haven't figured out whether to used dried or fake yet) to the board.

The problem I'm facing is that the scratchboard has a very smooth painted surface. Without the rough texture of paper, I'm worried my items will not properly adhere. 

Is there a type of glue, or technique for gluing items to a very smooth surface like scratch board?
I find a hot glue gun very versatile and forgiving for these types of applications. And it works phenomenally well for sticking irregularly-shaped items to smooth surfaces.



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