Glue problems?

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Forum topic by Garen posted 12-13-2009 08:56 PM 1017 views 0 times favorited 6 replies Add to Favorites Watch
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2 posts in 3283 days

12-13-2009 08:56 PM

Hi, I have been glueing some oak boards up in my shop and after the glue has dried i see these black dots. Iam wondering what they are? They sand out no problem. My first thought is bad wood glue and also it did harden fully. let me know your thoughts Thanks

6 replies so far

View Scott Bryan's profile

Scott Bryan

27250 posts in 4019 days

#1 posted 12-13-2009 11:40 PM

Garen, pictures would help but one thought that came to mind is that oak will get black stains when it is exposed to iron and moisture (present in the glue). This is a reaction between the iron and the tannins in oak. Normally I have seen these when black iron bar clamps come in contact with the glue. This would leave a black stain in the surface of the wood that is in contact with the bar clamp. But this is not normally just a black dot. So I am puzzled as to whether this is what is going on in your case.

-- Challenges are what make life interesting; overcoming them is what makes life meaningful- Joshua Marine

View ondablade's profile


105 posts in 3396 days

#2 posted 12-14-2009 12:28 AM

Never heard of anything like it, but is it possible that the black dots are mold/fungal growth?


-- Late awakener....

View a1Jim's profile


117328 posts in 3774 days

#3 posted 12-14-2009 12:54 AM

Scott has it very well covered.

-- wood crafting & woodworking classes

View matt garcia's profile

matt garcia

1902 posts in 3869 days

#4 posted 12-14-2009 01:49 AM

I’ve never heard of it either, but then again, I don’t use oak!!!

-- Matt Garcia Wannabe Period Furniture Maker, Houston TX

View Garen's profile


2 posts in 3283 days

#5 posted 12-14-2009 04:01 AM

I think it was the glue i switched to a different bottle and just glued up so well see. I did think about the mold thing but never have had a problem before. I use whatever species of wood the customer wants. Thanks for your inputs.

View SnowyRiver's profile


51457 posts in 3678 days

#6 posted 12-14-2009 05:02 AM

Yep…I think Scott has answered your question.

-- Wayne - Plymouth MN

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