Hot mop tar is a good way to waterproof projects like an indoor planter. Here's how it's applied. After it's heated in a kettle, hot asphalt is used to adhere layers of tar paper to cover the surface.

DEAR TIM: I’m building a room addition, and as I was doing the demolition of my outside wall I discovered tar paper was in the wall. I thought tar paper was just used on roofs. Why did they use tar ...

STATEN ISLAND, N.Y. -- Q. I'm building a room addition, and as I was doing the demolition of my outside wall I discovered tar paper was in the wall. I thought tar paper was just used on roofs. Why did ...