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A panel can feel straight in the shop and still look wavy the moment it hits reflection. In this video, I walk through how I approach block sanding for show-quality bodywork — not by rushing filler, but by understanding panel shape, block choice, and what the surface is actually telling you. Body filler is a refining tool, not a shortcut. If the metal isn’t as straight as possible first, no amount of sanding will save the panel — and the block will eventually expose it. This is where show-quality separates from work that only looks good indoors. What I cover in this video: • Why panels can feel straight but still read wavy • The relationship between metal shape, filler, and block choice • Why block length matters • How hand pressure creates (or hides) waves • What I’m looking for before a panel ever sees paint This isn’t about steps — it’s about judgment. The block doesn’t fix the panel. It tells you the truth about it. If you’re chasing long-term, show-quality results, this is the step you don’t rush