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Reinforced corner

12/29/21       
Stefano

I'm fabricate some white frames with reinforced cap top corners but some time I have this unwanted line as in my picture. Hard maple frames. I use water base finish, two coats of primer (280 sand between coats) followed two coat of white (400 light and between). Since I using water base paint, I glue the cap top with epoxy glue and I leave the glue dry for three days before send it. Some time the unwanted cap top line appear after apply the paint over the primer and some time are ok the day of the spray but the unwanted line appear the day after.
Thank you for your help
Stefano


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12/29/21       #2: Reinforced corner ...
RichC

Makes me think the epoxy and solvents in the finish aren't happy together. Call the finish and epoxy manufacturers. Something is causing the adhesive to swell in my opinion.

12/29/21       #3: Reinforced corner ...
Stefano

Using water base finishes it shouldn't be interfere with epoxi glue I guess

12/30/21       #4: Reinforced corner ...
RichC

It shouldn't, but do you have another idea?

12/30/21       #5: Reinforced corner ...
RichC

Just because it is water based doesn't mean there are incompatible chemicals in it.

12/30/21       #6: Reinforced corner ...
RichC

*aren't*

Sorry

12/30/21       #8: Reinforced corner ...
Tom Gardiner

An alternative theory, Spraying two coats of water-base swells the maple not the epoxy. Sand while the wood is still swollen. In time the wood dries and shrinks back to original dimension leaving excess finish above the stable glue joint.
A possible solution is to leave the first sealer coats longer before sanding to allow the wood to stabilize. Or use finer prime coats.

12/30/21       #9: Reinforced corner ...
Stefano

Thank you Tom to explain your though. I will increase the time to sand after the first coat of primer hoping it will help

12/31/21       #10: Reinforced corner ...
Thomas Hitefield

When we do an opaque finish, especially in white, we will apply a thin coat of 3M glaze on the joints. We get the glaze from any paint and body material distributor. Have never had a problem with it under any material we shoot, Lacquer, CV, 2k, it works well with all of them.

1/1/22       #11: Reinforced corner ...
Adam

You've got two problems. The glue line is very wide. The epoxy is now filler. Telegraphing is the term for see physical differences thru finishes.

There is a difference between TB1 glue and TB2. You can get telegraphing with TB2 because its soft/rubbery. The epoxy is the other extreme. Its very hard.

1/1/22       #12: Reinforced corner ...
Leo G Member

How about instead of making the cap joint, you use more of a spline that is internal so it doesn't show up as a telegraphing line.

You might end up with the miter line instead, just trading one problem for another.


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