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blo/poly/ms blend. poly seal out oil in second coat?

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Forum topic by BuffaloBrewer posted 01-22-2020 09:48 PM 188 views 1 time favorited 6 replies Add to Favorites Watch
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BuffaloBrewer

76 posts in 1449 days


01-22-2020 09:48 PM

Topic tags/keywords: finish poly blo finish blend

I’ve been wondering about the blo (or tung oil)/poly/mineral spirits blended finish. Does the first coat of the blend create a film from the polyurethane that will seal out the oil in additional coats? I’ve used it a few times with good results but can’t wrap my head around this question. Thanks for any info.


6 replies so far

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Toller

51 posts in 2231 days


#1 posted 01-22-2020 10:01 PM

It gives a soft film that will seal out the additional oil.
I’ve never understood mixing oil and varnish; perhaps someone can explain that for me.

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CWWoodworking

609 posts in 809 days


#2 posted 01-22-2020 10:35 PM

That’s what the MS is for. To thin it enough that it soaks into the wood pores. The second coat stays on top a little more.

One coat isn’t 100% sealing the wood. There just isn’t enough solids. That’s why it takes so many coats to get any measurable water resistance.

Theoretically you could not thin it as much after 1-2 coats to get more build. Most just stick with one formula and more coats.

View wildwoodbybrianjohns's profile

wildwoodbybrianjohns

818 posts in 178 days


#3 posted 01-22-2020 10:45 PM

The oil is there to bring out the grain, especially good for woods like maple and cherry. After the first or second coat, then I typically would go to just Varnish or poly mixed 50/50 with M.S; and leave out the oil.

-- Wildwood by Brian Johns: If you tell the truth, you dont have to remember anything (S. Clemens) Edit: Now where is that darn pencil/ tape measure!

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BuffaloBrewer

76 posts in 1449 days


#4 posted 01-22-2020 11:10 PM

thanks for the clarifications. i think i’ll start cutting back on the oil in the additional coats.

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CWWoodworking

609 posts in 809 days


#5 posted 01-22-2020 11:22 PM



thanks for the clarifications. i think i ll start cutting back on the oil in the additional coats.

- BuffaloBrewer

I would do samples. From a durability or application standpoint, you can totally leave the oil out. It provides a look and slows dry time and not much else.

The thinner is what will determine build. More thinner=less solids and vise versa. More solids=more build of finish.

But the first few coats, you want thin. Without thinning it just sits on top and you wipe most of it off. It also won’t level out as much.

View SMP's profile

SMP

1736 posts in 536 days


#6 posted 01-22-2020 11:42 PM

If you do a blend or varied course of different things, i find it easiest to just make the maloof blend and just use that for each coat. Nothing I tried was really noticeable to the eye when looking at them separately. Only when side by side and barely.

Different if I don’t want a film finish, but if i don’t mind a film or need the protection i have just been using homemade maloof blend or ArS

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