You spent hours building something beautiful. The joinery is tight, the surfaces are smooth, and you’re finally ready to bring the piece to life by applying a clear coat or stain. At first, everything seems great. But within seconds, you begin to notice dark patches appearing across the surface like a bad rash (it's poison ivy season, so I know what I'm talking about). Some sections are light and vibrant and others are dark and muddy. What's going on?! Well, congratulations. You’ve met...