Reply by RMR

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Posted on Gluing up lock-miter joints on plywood carcase

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13 posts in 3973 days

#1 posted 06-06-2010 06:25 PM

I had the same disappointing results recently with locking mitre joints on fairly large plywood panels on some casework. Some drew up nicely and others were open at the edge 1 -2 mm. Fortunately it wasn’t critical on the piece I was building but I’d prefer to get it right regardless. I used a water based wood filler and, once the sharpness of the corners were relieved a bit with sanding, it wasn’t that noticeable. I top coated with lacquer and it’s okay for the application.

The chamfer idea may work but you will double your opportunity for noticeable seams. If you do something like that make it bold enough to be part of “your new design” so it doesn’t look like a repair – just my opinion. Try the filler first, it doesn’t foreclose your options for something else if you aren’t happy with the results.

I was a little gun shy about using locking mitre joints again, at least on a long joint in a plywood panel (aren’t they ‘fun’ to set up?). Next time I’ll try a glue with a longer open time – I was using Titebond I. In hindsight, that was my problem. Thanks for the advice.

-- Bob, Kent, WA

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