HOW TO TIGHTEN STRETCHED CANVAS Turn your canvas over, raw back side facing up on a flat surface. It’s okay if the front side has already been painted (just make sure THAT side is dry!) Lightly spray problem areas with water. Use a hair dryer to dry the canvas where you just sprayed the water. Repeat steps as needed to reach desired tightness. Click to see full answer. Similarly, you may ask, how tight should a canvas be?A painting can have varying degrees of tension, from slack to taut to tight. Ideally, a painting should be “just taut” upon its stretcher; that is, the canvas should be held under minimal, even tension.Beside above, how do I keep my canvas from sagging? 5 Tips To Avoid Canvas Sagging Pay Attention to the Weave. Horizontal sag is most common, typically across the canvas weave. Staple the Long Sides First. Staple a clean line on the longest side and then move to the opposite side and staple a clean line. Add Cross Bars After Wrapping. Use Archival Glue. Work in a High Humidity Environment. Beside above, how do you get wrinkles out of a canvas painting? Do’s DO iron your canvas on high without steam. Many websites suggest using a little bit of water or steam when ironing. DO make your canvas taught. Canvases are made to be stretched, and the stretching process helps to get the last wrinkles out. DO use a damp cloth on the back of the canvas. Do you stretch a canvas before or after painting? Stretching the canvas after the painting is finished. If you do want to do it yourself, here are some guidelines. You do not have to stretch pre-primed canvas as much as you would unprimed canvas. You only need to stretch it enough to make it gently taut, enough that the canvas has no buckles or ripples.