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Finish Problem: "seams" appear days after poly is dry

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Forum topic by Kwit posted 119 days ago 659 views 0 times favorited 9 replies Add to Favorites Watch
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Kwit

76 posts in 465 days


119 days ago

I seem to have a problem with finishing some oak red oak tables made from 3.5” and 2.5” strips, 1.5” thick, glued together using TBIII, then finished with Minwax Dark Walnut

here’s a post of what I thought was a finished product: http://lumberjocks.com/projects/93962

It seems that after applying 4 coats of Minwax oil-based poly – then sprayed an apparently great finish coat – There were flaws developing nearly 3-4 days after drying. It may be a small bubble – or it seems like something is seeping out from the seams to create a very slight – be albeit – visible line at the seams in certain areas

It is not all over the pieces – just in certain areas – I built 4 tables like this.

I let my poly coats dry 24 hours – then 220 grit sand – clean with Mineral Spirits and microfiber cloths

My work shop temp is not super stable – but it has been between 62 and 57 degrees during the process

Any ideas appreciated

-- don't talk about it - be about it


9 replies so far

View JustJoe's profile

JustJoe

1554 posts in 545 days


#1 posted 119 days ago

Wazzat? A picture of a snowman in a blizzard? A polar bear laying on a cotton sheet? You promised a pic of red oak – show me the oak!

Without pics, any chance it is a glue-line you’re seeing?

-- This Ad Space For Sale! Your Ad Here! Reach a targeted audience! Affordable Rates, easy financing! Contact an ad represenative today at JustJoe's Advertising Consortium.

View Kwit's profile

Kwit

76 posts in 465 days


#2 posted 119 days ago

Yeah – sorry about the missing pic – here’s a link to my project post

http://lumberjocks.com/projects/93962

I didn’t think glue would still be an issue after much sanding, then stain, then multiple coats of poly

how long should I have waited after glue-up????

-- don't talk about it - be about it

View a1Jim's profile

a1Jim

109576 posts in 2084 days


#3 posted 119 days ago

It seems that your experiencing what Charles Neil calls push back.the pores your oak has absorbed to much finish and is seeping out of the pores ,it’s possible that you did not let your walnut stain dry well enough before top coating . It would have helped to use a grain filler be for putting any finish on.

-- http://artisticwoodstudio.com Custom furniture

View CharlieM1958's profile

CharlieM1958

15548 posts in 2725 days


#4 posted 119 days ago

I had the exact same problem on a project once. I just assumed it had something to do with moisture content and wood movement. I sanded everything smooth and added more finish coats. Once everything was perfect again, I brought the piece to its permanent home in my office. About two months later, the raised seams had returned, once again leading me to believe it is a moisture content situation.

-- Charlie M. "Woodworking - patience = firewood"

View KnickKnack's profile

KnickKnack

965 posts in 2073 days


#5 posted 118 days ago

I asked a somewhat similar question 1915 days ago here.
A couple of additional ideas there that may help.

-- "Do not speak – unless it improves on silence." --- "Following the rules and protecting the regulations is binding oneself without rope."

View Tony_S's profile

Tony_S

395 posts in 1589 days


#6 posted 118 days ago

You mentioned that you also refinished the restaurant’s existing tables. Any issues with the finish on those, or just the tables you made?
I would assume at this point that you used the same finishing process in both instances?

-- Striving for excellence motivates you; striving for perfection is demoralizing. ~Harriet Braiker

View MalcolmLaurel's profile

MalcolmLaurel

195 posts in 130 days


#7 posted 118 days ago

How long did the Titebond dry before coating? It develops full strength fairly quickly, but the adjacent wood has to dry out again; the water has to go somewhere and will take awhile to work its way out. If the wood is sealed with plastic varnish, it has nowhere to go.

-- Malcolm Laurel - http://MalcolmLaurel.com https://www.etsy.com/shop/MalcolmLaurel

View Snipes's profile

Snipes

13 posts in 751 days


#8 posted 118 days ago

glue creep?

-- if it is to be it is up to me

View gfadvm's profile

gfadvm

9595 posts in 1197 days


#9 posted 118 days ago

I’ve seen that term “glue creep” before and suspect that is the problem (even though I’m not sure of the definition of “glue creep”.
I’ve had this problem with Titebond3 on Jatoba glue ups.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

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