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

 
Subject : Veneer tape shadow
Posted : 2005-12-23 11:07 AM
Post #32659
I'm having great difficulaty trying to remove "shadows" of veneer tape. I assume it is residual glue. I've tried wiping with water and rubbing alcohol, and I've sanded with with an RO sander with 120 grit.

The tape has no holes and I bought it from a woodcraft store.

Any sure fire tips to remove the shadow?

Could this be caused by too much water used when applying or removing the tape? When removing, I use one of those sponge pens shown in the video.




 
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Don Stephan

Posts: 825

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

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Subject : RE: Veneer tape shadow
Posted : 2005-12-23 6:32 PM
Post #32662 - In reply to #32659
Mitch:

There are times I've had residual glue show up when I wiped the panel with a damp sponge. Since I use raw veneer, there is enough thickness that I just continue sanding and/or scraping until the residual is gone. To date, I've not had a sand through (now I'm cursed).

Don


 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

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Subject : RE: Veneer tape shadow
Posted : 2005-12-23 9:02 PM
Post #32665 - In reply to #32659
Mitch,

I suggest the "scrubby" side of a spounge soaked with water, and be aggresive about it. Sometimes this glue can get deep into the veneer.

Sincerely
Darryl Keil


 
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Enrico Konig

 
Subject : RE: Veneer tape shadow
Posted : 2006-01-04 10:57 AM
Post #32686 - In reply to #32665
I was going to put a question on the forum this morning for this exact same problem. Sometimes this veneer shadow does pretty much go right through the veneer, at least on standard commercial thicknesses (yes I have had some sand throughs trying to remove it ... ). And often the shadow does not even become that visible until finish time. I have been using aniline dyes a fair bit and then the shadow becomes VERY evident.

So at first I wondered if it was because I was using too much moisture to remove the tape after pressing, giving the tape glue even more of a carrier to move into the veneer, but then I tried just scraping and sanding the tape off and it was still there. Also I guess that can't be so if I should be using water & a sponge and scrubbing. What does one do if the scrubbing does not work?


 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

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Subject : RE: Veneer tape shadow
Posted : 2006-01-04 4:01 PM
Post #32688 - In reply to #32686
Enrico,

I have never had an issue with too much water around removing glue residue.

There may be another issue which is staining. This can come from regular tap water depending on the mineral content. I suggest using distilled water with veneer tape.

I dont know if this is your problem but using distilled water will take this issue out of the mix.

Sincerely
Darryl Keil


 
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Don Stephan

Posts: 825

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

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Subject : RE: Veneer tape shadow
Posted : 2006-01-04 7:15 PM
Post #32689 - In reply to #32686
Enrico:

If you don't mind my asking, what species of veneer are you using? I've used a number of veneers from Certainly Wood - walnut, mahogany, crotch mahogany, padauk, satinwood, quarter sawn white oak, flat sawn red oak, flat sawn cherry, olive ash burl, red gum, ... - and never had a "shadow" appear under the finish. Some of the veneers were stained with Homestead Finishing's aniline dyes before finishing and some were not. Some I finished with Fuhr's water based products and some were finished down the street with solvent based stains and finishes.

Are you seeing this "shadow" everywhere you had veneer tape? After finish sanding, if you wipe the veneer with water, naptha or alcohol will the shadow appear with each of the solvents (let each dry before trying another)?


 
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Enrico Konig

 
Subject : RE: Veneer tape shadow
Posted : 2006-01-04 8:21 PM
Post #32690 - In reply to #32689
Right now it's quartered cherry. Very bad shadows. And yes I do use distilled water. After talking to you on the phone today, Darryl, I tried scrubbing the living daylights out of it and it became less evident but was certainly still there. (I haven't sanded those samples yet and as they were quite wet by the time I finished scrubbbing, so maybe sanding will remove what remains ... but I'm doubtful). But these pressings were also problematic because of excessive bleed through of urea resin, so maybe the resin "locked" the shadow in.

I normally use denatured alcohol to check for defects before finishing. The last batch of pressings I did, however, I did not do that, and some quite noticeable shadows turned up once I used alcohol dyes. Not everywhere though: places where I had sanded a lot to remove other defects or marks showed no evidence of tape shadow.

I've had no problems whatsoever with either black or european curly walnut veneers. (And being so porous, the bleed through is certainly there too.)Or with quilted maple. But the other species of veneer I've had problems with (and quite consistently too) is with curly maple. Maybe it's like you said, and part of the problem is with staining from resin bleed through. This combined with the tape glue. I'll let you know if the problem persists once I start using the blocker. (Oh yeah, guess it won't, once I have that veneer stitcher ... )

Thanks for your advice today Darryl. This forum is tremendously helpful too. Thanks to everyone who contributes their knowledge and experience!


 
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Gerry

 
Subject : RE: Veneer tape shadow
Posted : 2006-01-11 8:44 PM
Post #32703 - In reply to #32690
Cherry darkens rapidly from exposure to light. Is it lighter where the tape was? Possibly everything else got darker. Sanding will help, but may not eliminate it.
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