Sanding molding can be a time-consuming and labor-intensive chore, especially if you have many linear feet to cover. To save time (and labor) as well as improving the consistency of the sanding job, we like to create a custom profile sanding block using sandpaper and auto body filler. Yes, you read that correctly, auto body filler.
First, take a small piece of ¼ inch plywood (wide enough to more than accommodate your molding profile and at least 3 inches long) and place a generous amount of auto body filler on top of it...