plywood - lines

[jack]

I have some furniture grade plywood, when I finish it, there are small lines in the grain that run perpendicular with it. Is it a plywood defect or am I sanding too much or not enough?

Thanks, Randy

[BillyBob]

You wouldn't happen to be sanding across the grain would you? What tool/method are you using for sanding?

Bob

[jack]

[BillyBob]

My guess is these are marks left from the machine sanding. You might try some hand sanding with a finer paper to see if they go away easily.

Bob

[bridger]

they may well be witness lines of the veneer layer just below the surface, finish veneer. if so, trying to sand them out will be a disaster.

[BUB 209]

Are they lines or more like evenly spaced, uniform rolling hills? I had the problem just described with some Baltic birch that came in 5X5 sheets. They sanded out using a 6" random orbit sander and 80 grit paper, but I probably came very close to going through the veneer.

[jack]