Stretching raw linen

[Richard Bingham]

Jean, thanks for posting that link.

There are some problems with discussion on that particular thread . . . truly, "rolling your own" is harder to do correctly than it appears to be.

[Allan Rahbek]

This is a drawing of a priming knife from around1640. The curved shape prevented the knife from furrowing the priming paste when dragged across the canvas.
Since the canvas will give inn a little when the knife or spatula is pressed against it you will have to use a tool with rounded corners ............ a credit card.