Carpenter's pencil graphite surprised me on a walnut table job

I was sanding a walnut table to 220 grit last Tuesday and noticed the grain looked off in one spot. Turns out a carpenter's pencil mark I made for a dowel location had soaked deeper into the wood than I thought. Graphite from those soft pencils can travel along the grain, especially on open-pore woods like walnut or oak. I read about it on a woodworking forum after the fact, but seeing it firsthand made me realize I should only use chalk or a marking knife on finish-grade pieces. Now I keep a cheap chalk line and a fine-point awl in my apron for layout on anything that won't get painted. Has anyone else had pencil marks bleed through a clear coat after sanding? That cost me an extra hour of re-sanding and I'd rather avoid the repeat.

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abby_kim558d ago

Honestly I gotta push back on this one. I've marked walnut and oak with regular pencils for years and never had graphite bleed through a clear coat after sanding to 220. If anything, the grit you used is probably the culprit, not the pencil. You might've burnished the wood or left dust in the pores that trapped the graphite on the surface. Chalk can smear worse than pencil on open grain, and an awl marks leave a dent that's way harder to sand out clean. I'd test your exact pencil on a scrap piece next time before blaming the tool.