A fresh coat of paint is one of the easiest and most cost-effective ways to breathe new life into an older property. And when it comes to exteriors, paint is also a great way to boost curb appeal.

Q: We have a much-loved deck that's about 15 to 20 years old. On a sunny Friday four years ago, I cleaned it well and stained it with a Behr product, but the stain pooled and peeled, despite my best ...