Paint a canvas with a map as back ground?

I would use the decoupage to attach the map to the canvas.

I would decoupage the map first, then layer the next pictures on top.

Hi Joyce, matt mod podge will work. Simply put mod podge all over your canvas and apply the map.Once dry the other pictures can then be mod podged on top of the map.

Hello Joyce,

Mod Podge or wallpaper paste to stick the map and decoupage, Use Mod Podge to seal the art work! Enjoy......

Joyce: this works well

https://www.michaels.com/mod-podge-gloss/10047537.html?cm_mmc=PLASearch-_-google-_-MICH_Shopping_US_N_Craft+%26+Hobbies_N_Smart_N_N-_-&Kenshoo_ida=&kpid=go_cmp-9972406265_adg-99939223639_ad-433378147590_pla-298409662251_dev-c_ext-_prd-10047537&gclid=Cj0KCQjwncT1BRDhARIsAOQF9LlPDM4xBsCRnppgflKKi6_v6Iw5OJx6Kb3V8NR-aGvhchLCTBh_RfsaArfQEALw_wcB

Could you mount a map to a foam core board (maybe using a mounting spray) and then use mod lodge to apply the other photos?

I'd use modge podge and a foam paint brush!

You could use streight pins or clips to hold them down

Hello. Have you considered using modge podge?

I like Modge Podge for all my decoupage and crafting needs It comes in several sheens gloss matte and satin, and application finishes to include fabric, outdoor, glitter,dishwasher safe, pearl and more!

Heres a helpful link.

https://plaidonline.com/blog/april-2014/how-to-decoupage-with-mod-podge

https://plaidonline.com/products/brand/modpodge?count=80

https://modpodgerocksblog.com/learn-how-to-mod-podge/