I need recommendations for varnishing a mural painted with latex and acrylic paint on wood panels in an outdoor/indoor space. Specifically, it is an enclosed indoor play space which is exposed on one side. It is a box with one open wall. It is not exposed to sunlight or other weather related issues except for humidity and heat. I am concerned about the contraction of the wooden panels due to heat with a hard sealer on top...I could use some experience and advice. Also, one part of the mural is on concrete. What is the appropriate varnish to use for both surfaces?

Use "gloss medium and varnish" from novacolor or golden