This question came up largely because we already have a sign on the property, right near the corner, that was in need of use. In the past, cloth signs were mounted to the board, but it had been a while. This real estate was just too valuable to let sit idle.
So, I did some research. I tried several options ... all of which turned out to be either expensive or impossible. Then I thought of chalkboard paint ... but that would not work on an exterior sign. However, that was headed down the right path. I discovered that latex paint (preferably flat rather than glossy) would hold chalk and wipe clean with a damp paper towel. Perfect.
Here was the first attempt, the test sign so to speak. Regular chalkboard chalk was used in this case. Soon, we'll get some colorful sidewalk chalk and see how that does. Both sides of the sign are painted and ... if this works ... both will soon sport messages that can be changed with ease and cost very little to create.
From my research, I also learned a little trick I pass along to all you other pastors out there. Such signs should be no more than 10 words long for quick reading while driving or walking briskly by.
It worked immediately. As I was putting the finishing touches on the sign, a woman stopped at the intersection near the sign called over to me. She asked, "Is that Philippians 4:4?" I acknowledged it was and she gave me a thumbs up. I take that as a good "sign" and a great start.