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Acrylic medium will work . . . "sorta". Success depends on the absorbency of the canvas back, and the board you intend to use.
This is a variation on "maroflage", the process of gluing canvas to architectural walls as murals. The time-honored method was to use a paste of white lead compounded with varnish and oil. The modern replacement is "Beva-Gel" which is a vinyl-acrylic adhesive marketed by Kremer Pigments to replace the use of lead compounds.
Beva-Gel is somewhat costly - depending on your requirements, the vinyl-acrylic adhesives used in the building trades for setting tile and other materials are chemically very, very similar, and quite inexpensive. Test samples I have in full-weather conditions so far show no difference between construction-type adhesive and Beva-Gel. (two years and counting)
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