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Thread: sealing problem
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10th September 2021, 12:27 PM #1
sealing problem
young fella I know recently finished a table from Macracarpa.
Was professionally biscuit joined, glued and clamped no problems.
We then lugged it home and he proceeded to fine sand it, used sanding sealer, sanded again x2
Then covered in Feast Watson Scandinavian oil, wiped off etc and allowed to dry, which has happened except for the knot holes after 3 weeks these are still very tacky.
So suggestions as to why this has happened and remedies please.I would love to grow my own food, but I can not find bacon seeds
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10th September 2021, 07:05 PM #2SENIOR MEMBER
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Could the knot holes, being end grain, have wicked in more oil than the surrounds? Enough oil that it isn't going to dry properly? Excess/sticky oil should be removeable with the combination of robust towel(s), turps, and elbow grease.
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10th September 2021, 09:29 PM #3
Do you know what type of Sanding Sealer was used? There are a few possibilities as to why it may not have been particularly effective over the problem areas.
Have you any idea as to how well dried the timber was? Natural resins may not have been fully polymerised and thrown the curative power of the finish askew.
- Andy Mc
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10th September 2021, 09:49 PM #4
Have tried texting the young fella but he may be out sowing his wild oats.
I would love to grow my own food, but I can not find bacon seeds
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10th September 2021, 10:19 PM #5
he surprised me....
Feast Watson sanding sealer 2 coats. Once dried sanded down to 4000 grit
Feast Watson Scandinavian oil, 1 coat worked in with fine steel wool, 2nd coat worked in with micofiber cloth.I would love to grow my own food, but I can not find bacon seeds
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15th September 2021, 11:57 AM #6
well no responses so far so I will ask for other options.
what if we sand the whole table back to raw timber and start from scratch.
How do we deal with the knot holes? as they are still tackyI would love to grow my own food, but I can not find bacon seeds
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15th September 2021, 12:48 PM #7
As I mentioned earlier, it sounds like the end-grain sealer didn't do it's job and the knots have wicked up excess finish.
My approach would be more or less as Alkahestic described above; moisten a cloth with turps (or appropriate thinner) to wipe away the excess bloom from the knots, then buff the heck out of it. Wait a while (I'm thinking a day or thereabouts) and repeat the process until it stops weeping. It takes time 'n effort, but it's still quicker than waiting for it to dry naturally. (Which it would... eventually.)
Then it should be a simple matter of an overall sand and a final coat or two over the whole piece.
Depending on how many times I had to repeat the wipe-down process, I may apply a thin smear of finish over the knots and then do a wet power-sand with finishing grade paper. The slurry formed this way tends to block the grain, much like an end-grain sealer, and the heat from sanding generally tends to 'assist' the finish with setting.
I should point out that I don't use F&W for a couple of (different) reasons, so it may not react the way I'd expect and the wet sand may actually exacerbate the problem.
Anyways, with the above approach, there should be no need to sand any area except the affected ones IF doing the wet sand step. Which always simplifies things.
I really don't think that sanding the whole piece and starting again would have any benefit whatsoever... the knots would still be holding excess finish and carry the problem forward.
- Andy Mc
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15th September 2021, 03:05 PM #8SENIOR MEMBER
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I threw my 2c in the ring and I'm all out of 2c now. On the removal of the tacky bits, turpentine and a rag should get rid of it. Sanding to 4000 grit is probably a bit excessive though. My understanding of (non burnishing) oil finishes is that they need to soak into the timber and only a thin layer of the oil actually adheres and dries to the surface of the timber, which is why the application is normally wipe it on, wait a short period, and wipe it off. Sanding beyond 240 grit closes off the timber pores such that the oil penetration becomes limited. Any oil left on the surface beyond what bonds to the timber is what becomes tacky.
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