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: 118

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


How to Get Your Own Music on Spotify

Started by Shane Speal in Feature Articles 13 hours ago. 0 Replies


Started by Brent Kasl in Building Secrets, Tips, Advice, Discussion. Last reply by Jerry Jordan yesterday. 2 Replies

s/s lm386 draw amp,

Started by GARAGE HERMIT in Building Secrets, Tips, Advice, Discussion. Last reply by GARAGE HERMIT yesterday. 9 Replies

Nut milling

Started by Lothar Ahnert in Building Secrets, Tips, Advice, Discussion. Last reply by Taffy Evans on Wednesday. 3 Replies

Latest Activity

Dave Lynas posted videos
17 minutes ago
AGP # liked Randy S. Bretz's photo
2 hours ago
AGP # liked Dave Lynas's photo
2 hours ago
AGP # liked Tyler Williams's photo
2 hours ago
AGP # commented on Dave Lynas's video

Frankie & Johnny

"The Big Box, the Duke, the Tin Drum, Dave Lynas and the Single Digit are all in fine voice today!,…"
2 hours ago
Derek Rose commented on Andries D. EKER's video

Stormy Monday A D Eker 2019

"Excellent playing and crooning Andries! Thanks for sharing the secret sauce! Super acoustic tone…"
2 hours ago
AGP # liked Dave Lynas's video
2 hours ago
Derek Rose liked Andries D. EKER's video
2 hours ago
AGP # commented on AGP #'s video

''Your Cheatin' Heart''

""Thanks Poorness and Danny Boy" for those kind and encouraging comments, very much…"
2 hours ago
AGP # commented on AGP #'s video

''Your Cheatin' Heart''

""Thanks Dave" for the Clean & Clear Comment.  And also many thanks for the…"
2 hours ago
Matthew Borczon replied to Slowpaw Steve T's discussion CIGAR BOX NATION CHRISTMAS ALBUM 2019
"sent you a submission yesterday. hope you like it"
2 hours ago
AGP # commented on AGP #'s video

''Your Cheatin' Heart''

""Thanks UJ", It's been a month now since my last build, must be a record, …"
2 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 -->