How to sand primed pine plywood bookshelves? - Woodworking Talk - Woodworkers Forum
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post #1 of 5 Old 03-28-2016, 07:17 AM Thread Starter
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How to sand primed pine plywood bookshelves?

I assembled some 3/4 pine plywood bookshelves to incorporate into a builtin wall unit. The shelves are glued into dados. After priming them they are fairly rough, a little more than I expected. My question is, will sanding using a random orbit sander cause too much vibration and weaken either the dado joint or the ply-to-ply bond on each shelf?

I ask because the last time I tried to sand plywood with the same sander, it was 1/4" barn board siding on sawhorses (i.e. Not on a hard flat surface) and the plies were delaminating, from what I'm assuming was due to the vibration. I am afraid the bookshelves may do similar or weaken the dado.
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post #2 of 5 Old 03-28-2016, 07:31 AM
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The vibration from sanding won't affect the joints unless they are coming apart anyway. The next time you build something it would be better if you sanded the parts before you assemble. Then after assembly it only takes minor sanding from handling or where you wiped glue off with a damp cloth.

Sanding plywood didn't cause plywood to delaminate. For plywood to delaminate it had to be defective plywood. This is common with Chinese made plywood.

The problem you will have sanding the shelves now is the sander won't sand up to the corners. It will take a great deal of hand sanding where you can't get to with the sander.
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post #3 of 5 Old 03-28-2016, 08:09 AM
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Leave the power sander on the shelf. It will only take a few swipes by hand to remove the roughness, 220 grit.
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post #4 of 5 Old 03-28-2016, 09:54 AM Thread Starter
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Quote:
Originally Posted by Hammer1 View Post
Leave the power sander on the shelf. It will only take a few swipes by hand to remove the roughness, 220 grit.
I tried this. 220 wasn't enough and it took a considerable effort with 150. I just ha e so much surface to cover. Five 30" shelf units, 5 shelf son each. I'm only needing to finish the inside though.


FYI for the other poster, I did sand prior to assembly, I just waited until after to prime.
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post #5 of 5 Old 03-28-2016, 10:44 AM
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Try using a pad of very coarse steel wool. The strands are fairly thick and strong. The strands are flat and cut like a million chisels without shredding the painted surface like sand grains do.
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