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There are a number of heat-sensitive dry-mount methods in use by conservators for this purpose. The current order of the day is to use methods which are reversible with minimum stress on the artworks.
Kremer Pigments markets a water-based vinyl-acrylic adhesive (Beva-Gel) intended to replace traditional "maroflage" materials and it works quite well. Its cost is also higher than a cat's back, and the stuff is not materially dissimilar from adhesives commonly available in any paint store for installing heavier commercial type wall coverings which are chemically similar. I've used these with good effect, and see little difference between them and Beva-Gel.
One supposes the piece being mounted was adequately sized and primed before it was painted on, so priming the backside prior to mounting on a panel is superfluous. For the record, rabbit skin glue is not compatible with acrylic polymer coatings, and may or may not adhere dependably. RSG definitely does not bond to synthetic laminates like alumalite or dibond panels.
RSG is perfect for adhering raw canvas to bare wood or composite materials such as MDF, however.
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