Originally Posted by Katie Black
Hey thanks that's helpful.
When you mount two strips of wood to the back of the panel, do you use glue or screws?
I use wood glue (Titebond II) . I use 10# weights from a weight lifting set to hold the strips down while the glue dries (1/2 hour)- but you could even use some heavy books. Since a panel is thin, if you were to use screws you'd have to put them in from the painting side, and that would not work for a panel that was already painted.
Rather than glue the entire strip - which you would normally do, - sometimes I only place a few dollops along the length. This makes it easier to remove if at some point you want to store it and have it take up less space - or put it in a different type of frame.
These strips also act as support to keep the panel from warping.
I use 3/16 hardboard rather than birch panels. Hardboard (masonite) costs less, is less prone to warping, and easier to prep. A sealer is not necessary with hardboard. I paint the back with house paint, and the painting side I just gesso as you would canvas. The grain does not lift (there is no grain) like birch tends to do, and it is smooth with no imperfections like birch sometimes has. If you do use hardboard use the 3/16". It is also sold in 1/8" thickness but the 3/16" is better.