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Glue Bleed?

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Forum topic by KnickKnack posted 64 days ago 145 views 0 times favorited 7 replies Add to Favorites
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KnickKnack

47 posts in 103 days


64 days ago

Topic tags/keywords: question

The following has happened to me a few times now, and I don’t recall reading anything about it, so I’m hoping someone here knows the reason/answer/solution…
On 3 things that I’ve done now (2 pine, one oak) I glue things together, like a board. I make everything beautifully flat – even a blind person running their fingers around couldn’t tell there’s a join. In 3 days time there’s a very slight line (it’s proud) where the joint is – like the glue has started to make a bid for freedom. I sand it down again – but the line comes back. One thing that’s still in the garage has been sanded down 3 times now.
On one piece, immediately after sanding I finished with a wax/oil mix and that’s stayed flat.
The small oak table I finished with varnish/oil/spirit mix – but that’s now starting to “show” the line.
Has happened with both Bostik and UHU wood glues, both fast setting (in Portugal I am not spoiled for choice).
Thanks in advance for the pearls of wisdom

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Christopher

199 posts in 457 days


64 days ago

I have no idea. Never run into that. I am sure someone here has and will be helping shortly though!!

-- Sometimes when I am building something and it is out of square, I just bend my square.

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John Gray

882 posts in 422 days


64 days ago

I would estimate (guess) that you are not using enough clamping pressure. You can remove the squeeze out with a cabinet scraper and you may be applying the finish to quickly? Hope to see what others say.

-- Only the Shadow knows....................

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lew

1748 posts in 292 days


64 days ago

I read where using biscuits, to make panels, and sanding immediately caused the surface to “telegraph” the biscuit position. Seems the wood swelled where the biscuit was located. If the piece was sanded too soon, the wood shrank as it dried and left an indentation at the biscuit location.

What you are describing seems to be the opposite but maybe there is a relationship. Maybe if the piece dried for several days, then sanded, it might not happen.

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teenagewoodworker

2134 posts in 305 days


64 days ago

heres what i think it is. if you are using yellow, white glue, or any other water based wood glues if there is humidity in the air it will cause it to swell a bit. you run into the same problem with using water based dyes where the water there also makes the glue swell some. thats where a trace coat or wetting the surface with water comes in handy along with raising the grain. a bit off topic. but i think if there is some moisture in the air it is causing the glue to swell and when you put the oil/wax mixture on it the wax sealed the glue in so it hasn’t risen yet. but the varnish mix is more of a penetrating oil mix so the oil penetrated and did not fully seal off the surface. because thats what oil does it penetrates so the moisture can still cause the glue to rise. the wax stayed on the surface sealing it off from the moisture in the air. hope that helps some! :)

P.S. I’m Portuguese too! maybe not living in Portugal but i got Portuguese blood ;)

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GarageWoodworks

79 posts in 159 days


64 days ago

It is sometimes referred to as glue creep or glue line creep. It has happened to me several times with Titebond II. I had to re-sand and re-finish.

Not sure why it happens though…

Google “Glue Line Creep” OR “Glue Creep” Good Luck.

Here it is discussed in another forum:
http://www.woodworkforums.ubeaut.com.au/showthread.php?t=6780

-- -Brian of High Point, NC (http://www.garagewoodworks.com)

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John Ormsby

194 posts in 273 days


64 days ago

The type of glue you are using will cause glue line creeping, as was pointed out by the folks in the above link.. Varying pressure is put on the glue as the wood expands and contracts.

This glue line problem can be eliminated by using a resin based glue or epoxy glue.

If one is using biscuits, they will run the risk of having the biscuit mark show through the finish if the area around the biscuit is sanded too early. The joints must be allowed to dry thoroughly before sanding.

-- Oldworld, Fair Oaks, Ca

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KnickKnack

47 posts in 103 days


63 days ago

Thanks to all.
Somehow I feel a bit better that my problem has a name, so now i can talk about “the ol’ GLC problem” (Londoners would get the double-entendre there).
I looked up “Glue Line Creep” on google (I can’t bear to use “google” as a verb) and read everything. Seems certainly to do with moisture content changing – either the wood shrinking (it got wet from the glue), or the glue expanding. Harder glues seem to suffer less.
I’m gonna have to plan a trip to somewhere to stock up on glues, tung oil, and all those other things I can’t seem to get here.
I’ve just finished glueing up another panel and I’m gonna try to be patient – not something I’m known for.

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