Many years ago, I did backdrops and flats made of muslin or canvas. I used
latex house paint in gallons. I would white out the scene each year with latex
and repaint the new scene on the backdrop and flats. I did this for 4 years.
We folded the backdrop, drying on the stage floor, each morning, to make way
for the PE classes overflowing on stage. It didn't crack or flake.