My artist wife typically paints on 1/4 in or 1/8 in (3 ft by 4 ft) untempered masonite panels. The panels are always first painted or gessoed on both sides and on all 4 ends. They are usually not framed. Never had a problem until several years ago. Up until then the panels which I bought from regular lumber yards were smooth on one side and rough textured on the other side.Now the panels are smooth on both sides. Now they warp in a short period.So I tried several things.
- I glued a baltic birch plywood cross brace on the back. No luck.
- I glued a baltic birch frame around the back plus the cross brace. Again. no luck.
- I added a regular frame . Again, no luck. Any suggestions? My wife has shifted to canvas panels. but would like to go back to masonite.