Finished two oak scarf joints last week and after clamping I always lay the neck on its side against parchment paper so it won't stick. After about an hour I remove and clean up any excess glue and reclamp.

Both necks had about 4-5 eraser head sized black circles that looked like mold, never happened with maple and only on the initial side laying down which had the most excess glue, using Titebond.

After drying tried to sand out but no luck, can I use  a white vinegar or something else  to remove that won't damage the wood?  The final finish will be a clear gloss spray

Very strange

Views: 97

Reply to This

Replies to This Discussion

I have used oak for several scarf joints and have not experienced this...

I wonder about bleach not vinegar. But either way, try to test on scrap.

I am fond of distressing the wood. In that view, they may be features, not blemishes.

Brent, I don't think you are dealing with mold. Oak has tannic acid within it and may be what you are dealing with. A good wood bleach from your local home improvement store will help remove it. Another possiblity is the glue you are using, TB 1 will not leave any dark spots on oak however TB 2 will leave a faint discoloration removable with sanding. TB 3 will leave a darker almost purple color on oak that has not been seasoned or kiln dried the correct amount of time. 

Luck on your build


Hi Brent, I've had this and put it down to two things, tanins in the oak or my metal clamps touching the glue line and causing the stain.

Any way I always let the glue get very close to set before removing and ooze out, so the contaminated bits stayed in the glue and not rubbed into the wood. I have glued many necks [Titebond Original] but this only happened the once.



I tried to bleach out with not much success so my guess is it's tannins in the wood brought to the surface

Isnt too noticeable after clear coat


The Essential Pages

New to Cigar Box Nation? How to Play Cigar Box GuitarsFree Plans & How to Build Cigar Box GuitarsCigar Box Guitar Building BasicsCigar Box Guitar Parts Store

Site Sponsor

Recommended Links & Resources


Help Tuning

Started by Joan Pace in Other stuff - off topic, fun stuff, whatever. Last reply by Cause the Blue rat on Sunday. 3 Replies

Lid thickness question.

Started by Will "KOOL DOG HOOCH" Bonner in Building Secrets, Tips, Advice, Discussion. Last reply by Will "KOOL DOG HOOCH" Bonner on Thursday. 9 Replies

Blog Posts

Indiana State Fair

Posted by Rick Tish on August 19, 2019 at 7:46pm 0 Comments

Buying in bulk

Posted by Rick Tish on August 17, 2019 at 6:31pm 0 Comments


Posted by Rick Tish on August 15, 2019 at 7:08pm 0 Comments

first post

Posted by Rick Tish on August 14, 2019 at 8:23am 0 Comments

Latest Activity

Taffy Evans replied to Dave Barrett's discussion Some things I learned from my latest build
"Hi Will, no disrespect but I figure we are all friends on here so I don't understand this…"
45 minutes ago
Dirk replied to Dirk's discussion Trip to LA and looking for CBG enthusiasts
"That’s very nice of you, John.  But I won’t get out of LA in this 2 weeks. I am…"
1 hour ago
Dirk replied to Dirk's discussion Trip to LA and looking for CBG enthusiasts
"Thank you for the reply. We got connected by now. He knew what to do. "
1 hour ago
Danny Gordon commented on Jim Morris's video

Summertime on Cigar Box Baritone Ukulele

2 hours ago
Danny Gordon liked Jim Morris's video
2 hours ago
Danny Gordon commented on Andries D. EKER's video

Fields of Green A. D. Eker 2019

2 hours ago
Danny Gordon liked Andries D. EKER's video
2 hours ago
Cause the Blue rat replied to Joe Caruso's discussion When will you stop building?
"Actually as of right now I have two cigar box body guitars that I bought. And the two electric…"
3 hours ago
AGP # commented on Dave Lynas's video

Midnight on the Water and Grumpy Old Man

"Love a Drink of Scrumpy (aka Apple Cider) Dave, :-), trouble is nearly all the commercial brands…"
3 hours ago
Paul Craig replied to Paul Craig's discussion What's on your workbench?
"Usual Strat wiring has neck on 1 tone and middle on the other tone while bridge is no tone. That…"
3 hours ago
Clint Spotts commented on Smoothead's photo

My new Volvocaster

"Like the skull details on the pickup! Badass build. How about a demo vid?"
5 hours ago
Clint Spotts liked Smoothead's photo
5 hours ago



© 2019   Created by Ben "C. B. Gitty" Baker.   Powered by

Badges  |  Report an Issue  |  Terms of Service

\uastyle>\ud/** Scrollup **/\ud.scrollup {\ud background: url("") no-repeat scroll 0 0 transparent;\ud bottom: 25px;\ud display: inline !important;\ud height: 40px;\ud opacity: 0.3 !important;\ud position: fixed;\ud right: 30px;\ud text-indent: -9999px;\ud width: 40px;\ud z-index: 999;\ud}\ud.scrollup:hover {\ud opacity:0.99!important;\ud}\ud \uascript type="text/javascript">\ud x$(document).ready(function(){\ud x$(window).scroll(function(){\ud if (x$(this).scrollTop() > 100) {\ud x$('.scrollup').fadeIn();\ud } else {\ud x$('.scrollup').fadeOut();\ud }\ud });\ud x$('.scrollup').click(function(){\ud x$("html, body").animate({ scrollTop: 0 }, 600);\ud return false;\ud });\ud });\ud \ua!-- End Scroll Up -->