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Knots/Sap and poly?

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Forum topic by AAANDRRREW posted 01-10-2016 02:12 PM 324 views 0 times favorited 6 replies Add to Favorites Watch
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AAANDRRREW

118 posts in 639 days


01-10-2016 02:12 PM

Hello all,

I’ve been working on a pine bench the wife and I plan on donating to our curling club for a raffle item. Construction went well, then the wife burnt some curling stones and brooms into the top of the table with her wood burner. We are pretty happy with the results (we are both still novices). However, there are a couple knots where the poly doesn’t seem to be curing as quickly. I am concerned that there is sap around the knots causing this – which would be odd because I did not notice any when sanding it. But, if it was sap, how does one deal with that when finishing?


6 replies so far

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bearkatwood

1214 posts in 478 days


#1 posted 01-10-2016 03:26 PM

Charles Neil said he can stop pitch running by using a coat of shellac.
https://www.youtube.com/watch?v=Zn2uv3BP358

-- Brian Noel

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firefighterontheside

13520 posts in 1323 days


#2 posted 01-10-2016 03:34 PM

Dewaxed shellac. I’ve done it and it worked well.

-- Bill M. "People change, walnut doesn't" by Gene.

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AAANDRRREW

118 posts in 639 days


#3 posted 01-10-2016 03:44 PM

Ok, but as it sits now, I have a few coats of poly already on it – I’m hoping it cures more and it’ll be fine… but as I sit now I’m kinda stuck, right?

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TiggerWood

271 posts in 1073 days


#4 posted 01-10-2016 04:20 PM

I’ve ignored this in past projects and never had a problem. Years have gone by and the knots haven’t caused a problem.

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firefighterontheside

13520 posts in 1323 days


#5 posted 01-10-2016 04:28 PM

Is the bench sitting in a heated dry shop or somewhere cold and damp? This time of year finishes can have a hard time drying.

-- Bill M. "People change, walnut doesn't" by Gene.

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AAANDRRREW

118 posts in 639 days


#6 posted 01-10-2016 04:35 PM

It is sitting in my heated basement of my house. I didn’t see or feel any sap during the entire construction or finishing of the bench until now, maybe. Last night at 10 pm I put what was a 3rd coat of minwax poly, diluted 50/50, wipe on. The 2nd coat was put on at about 9 am and was nice and dry at 10 pm. This morning at 9 am, I went to look at the bench, and although some spots are dry to the touch, the top of the bench was a little tacky in a few areas, but the knots seemed worse – I was concerned it was sap related. I will check back later in the day – I’m not sure if I want to do anyother coat yet or just call this one the final and rub it up to remove the couple nibs I have.

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