Hello, dear fellow artists!
I have a little problem with my MDF boards recently. When I purchased them(they were cut to measure for me), they were absolutely fine and straight. Still are. But when I mounted an oil painting on paper on it, it looks like it warped, slightly. Not too much, but it is not laying absolutely flat on a table. I use an acrylic medium to mount the painting.
Is there any way to fix that? I tried to put it under weight, its a bit better, but still not straight. Is it ok to sell it like this or would it pose a framing problem later?