I pasted this to the back of a late 19th century painting. The canvas had a large loop on the surface. I sprayed what I thought was a light, even coat onto the back of the painting. I didn't oversaturate it in any way. A few minutes later the canvas was stretched! I was very impressed with the results. And then I woke up the next morning and was very disappointed to see that the picture was MUCH more wavy than before I applied this spray.
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