Your pencil marks, or did a crumb catcher scribble on something?
(Usually a big difference)
I use a soft lead carpenters pencil, the rectangular ones..
The key, in MHO, is soft lead and only as much pressure as needed... you're
marking, not scoring, right?
I usually kind of scribble a pattern of light lines on the surface before
sanding, to help reference flatness as they get sanded off..
Pencil lead on the wood surface is easy to get rid of or "erase" with light
pressure and fine grit paper, while grooves from heavy pressure on the pencil
require courser grits and a lot of language that the grand kids aren't supposed
to hear.. YMWV
Please remove splinters before emailing
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