“Well, at least the books aren’t being stolen or destroyed, like the leftists do to our yard signs.”
Face the sign to the road and coat the back edges with a few inches roofing tar. It won’t come off and will ruin everything it comes in contact with...clothes, car interiors,...
Most signs are stolen at night and in the dark they won’t even know what it is until it’s too late. Then they will have no choice to either get it all over their car, or walk/run home.
Confession: I actually did this in the 2008 election based on a FReeper suggestion. A couple of days later I found the sign laying on the curb, lol. Back then we didn’t have security cameras, so I couldn’t see the perp. But it was fun knowing he or she had some cleaning up to do. Hehe.