Keeping Gouache Wet Outside

I brought my gouache to a friend's beach house yesterday
to experiment with it outdoors.

"Sea Wall"

gouache study on bristol board

My friend Gail Sauter shared this info on Facebook 

so I stopped at the Dollar Store and bought some micro fiber cloths. 

(they didn't have the sponges)

I wet them and put my palette paper on top 

inside a tupperware box with a lid. 

that I put on whenever I wasn't painting. 

I managed to do three small quick studies on paper and 

the left over paint was still wet!  

My set -up and the view! 

My goal is to see things more simply and 

I'm finding gouache helps me do that.