[Leica] What are you using to glue your prints down?

[rdandcb at home.netspeed.com.au (Rick Dykstra)]

Hello folks,

I need a product to glue larger prints to foam backing boards, for  
framing.  I could use the same product to glue the mat boards to the  
backing board too I guess.  Up till now I've been using Henzo acid  
free contact adhesive, with a number of dots between the print and  
the board (and the mat and the board).  But I think I need something  
with broader cover to keep large prints flat to the board.  I want it  
to be repositionable/removable.  The thing I've liked about the Henzo  
product I've been using is that the prints can be peeled from the  
board or from an album and the glue simply rubbed off.  So something  
with similar properties would be handy.

I've seen some spray on glues at the art shop.  Any experience?   
Other products?

Thanks, Rick.