Darryl Keil Last Activity 2025-09-09 11:09 AM
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Douglas

Posts: 11

Joined: 2006-12-05
Location: WILKES-BARRE,PA

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Subject : bad seams
Posted : 2006-12-05 8:53 AM
Post #33474
I used a router to join maple veneers in a jig. Perfect joints,used veneer tape,super tight seams,no light.Glued down on 3/4" mdf with ppr glue in vacuum press.Left them in press 2 full days good tempature, took out stacked two days ,removed tape, sanded look great.Spraying first coat of lacquer and the seams appear to be opened, but not in raw wood stage only when clear lacquer was applied, is this normall or will my finish keep sinking into the joint and never level out.


 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

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Subject : RE: bad seams
Posted : 2006-12-05 6:17 PM
Post #33475 - In reply to #33474
Douglas,

What is PPR glue?

Sincerely
Darryl Keil


 
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Douglas

Posts: 11

Joined: 2006-12-05
Location: WILKES-BARRE,PA

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Subject : RE: bad seams
Posted : 2006-12-06 7:29 AM
Post #33478 - In reply to #33475
Plastic powder resin


 
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Don Stephan

Posts: 825

Joined: 2003-07-18
Location: Cincinnati, Ohio

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Subject : RE: bad seams
Posted : 2006-12-05 8:20 PM
Post #33477 - In reply to #33474
Ditto Darryl's question.

Not sure why the material was left in the bag 2 days. How long was the pressing allowed to cure in open air before sanding and spraying? If the glue has high moisture content some open time is needed to allow the moisture to evaporate before surface preparation for finishing.

How well was the veneer surface leveled after pressing? If there was no glue bleedthrough during pressing, and the veneer absorbed some moisture during w days in the bag, it's possible the veneer swelled ever so slightly and the edges were ever so slightly crushed. If the surface of the veneer wasn't well leveled before finishing the seam would then be slightly lower than the field of the veneer.

If there is not a visible gap at the seam then the situation might simply be requiring more coats of lacquer to level out the finish. Generally 2-3 coats of finish are applied to create some "build". If a minimal build is desired, it should still be possible to spray 2-3 coats, sand back to a good filled and level surface and spray a final thin coat.


 
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Douglas

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Joined: 2006-12-05
Location: WILKES-BARRE,PA

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Subject : RE: bad seams
Posted : 2006-12-06 7:37 AM
Post #33479 - In reply to #33477
Platic powder resin adhesive.Left in the press over night with heating blanket ,next morning removed blanket left in press rest of the day, say 8 hous or so removed and stacked two days in normal room temp. with air movement around to assure proper drying before any machining or sanding.


 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

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Subject : RE: bad seams
Posted : 2006-12-06 9:34 AM
Post #33480 - In reply to #33479
Douglas,

A couple more questions.

What specifically did you use for a finish?

Do you think the finish actually opened up the seams or did it just reveal that which was already present? Sometimes you don't see the finer things until the finish goes on.

Is the gap at the seams evenly opened up all the way down or are some places tight and other more open?

Sincerely
Darryl Keil


 
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Douglas

Posts: 11

Joined: 2006-12-05
Location: WILKES-BARRE,PA

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Subject : RE: bad seams
Posted : 2006-12-07 6:21 PM
Post #33482 - In reply to #33480
Darryl, I used a clear pre-catalyzed lacquer. I think it just revaled it more, it's not actully opened up. but it could be a little tighter in some places.I did countinue to put my additional coats of lacquer on and it did fill in the seam and leveled off.I just was't satisfied with visually seeing the seam "indent" after the fist coat.Is it possible that wetting the veneer tape for removal is effecting the seam in maple.Or maybe it's the guy shooting bad joints.Thanks for all your input.Doug


 
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Tom Eaves

Posts: 6

Joined: 2005-05-28
Location: plainfield, il

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Subject : RE: bad seams
Posted : 2006-12-07 9:11 PM
Post #33483 - In reply to #33482
Doug, Next time try dry sanding off the veneer tape! What may be happening is when you were wet scraping off the tape you were pulling loose pieces of the veneer seam with it.In your post you said that the seam look tight and I think you were right. While cutting your seam with the router, the bit was making tears in the wood fibers which were not detectable by eye. I hope this will help you on your next projet. Tom
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