Bluewhippet Arts' Top 5 Tips for Squaring your CanvasStretched Canvas is Square Right!? Here are some tips to make sure they remain so...Measure the stretcher canvas frame before working on. Using an expanding tape measure, check diagonally across the frame from L to R and R to L respectivly: the numbers should equal. If they do not match, first remeasure, than a light tap on the corners with a mallet could help.If priming raw canvas with Gesso, or applying another coat for acrylic and wat [...]