Can you iron a diamond painting canvas?

Never iron the drill side: heat can dull the resin and soften the glue. For a creased canvas, the safest method is to leave it flat under books for a few days, protected by baking paper.

If a crease will not go, iron only the back, on a low setting without steam, with a cloth between the iron and the canvas, and test on an edge first. See also our article on warped canvases.