How To Get Rid Of Warped canvas

Have you ever left your canvas leaning on something only discover you've created a big bulbous dent in your canvas. you try to paint over it and it sags like an concave blister.

Well here's a little tip I shared on youtube...you know the site that demonetised me! lol ( do people still lol?)

Anyway , hope you find it useful, if its helped you please feel free to resteem it.