Using the paint is akin to posting a "No Trespassing" sign, although not everyone knows what it means. So far, more than 20 states have a "purple paint law" in place, the Hudson Valley Post reported.

The best paint in our exterior paint ratings is Behr Marquee Exterior, sold for $51 per gallon at Home Depot. For around $10 less and almost as good, there’s Behr Ultra Exterior, also sold at ...