Originally Posted by
Mel Fulks
A better way to proceed , that will last much longer.
Forget the slats. Cut a piece of plywood to desired size. Use Titebond 2 glue , to glue a piece of white , or “un -bleached “ “cotton duck”.
It can be bought at any fabric store. Prime ,draw, paint. It’s a proven method that goes back to at least 1890. Don’t let “I ain’t never
heard of that before” , Stop you from a long used proven method. You might wonder why you have not heard of it before, it’s because it is not
in magazines and not seen much on TV craft shows. The modern “sign board” is its grand -child. Excellent expensive stuff. Old method
is easy and every bit as good. IF you wrap the canvas all around to protect the plywood from the weather.