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7th June 2018, 05:27 PM #16
Blackbutt. As previously stated, I did a number of different tests with the Blackbutt board, because it is the most important.
Raw timber sanded to 800 then 3000.
9. Blackbutt sanded.jpg
Sanded to 240, oiled, oiled, then a quick buff with 3000 again.
11. BB 240-oil-oil.jpg
Sanded to 240, oiled, sanded to 800-3000, oiled, then a quick buff with 3000 again. (this one is actually identical in colour to the previous one - just a very slight difference in photo exposure)
12. BB 240-oil-800-oil.jpg
Sanded to 800-3000, oiled, oiled, then a quick buff with 3000 again. This one is just a little darker than the previous two - perhaps it is just this little patch of timber that is darker?
13. BB 800-4000-oil-oil.jpg
One coat of home made WOP (50% Polyurethane, 25% BLO, 25% Gum Turps)
The light for photos was a little bit variable today, so even though it may not look it, this one is significantly more tinted than the Osmo patches.
10. BB HM WOP.jpg
I want to try this with WOP based on Tung Oil - the BLO lends an orange tint which I'd prefer to not be there. The WOP does bring out the quilting though (but I'm not sure how it will go with red wine).
Of the three Osmo result on BB, the middle one can be discarded - more work in sanding for exactly the same result.
There is slightly more quilting effect with the third one, because it the raw timber was sanded up to higher grit (3000).
However, because the Osmo Oil sits up on top of the timber so much, the first one (sanded to just 240,oil,oil) is almost the same, and they certainly feel the same. The Oil has filled up the 240 grit scratches in the first one, and then i just buffed (them all) with 3000 briefly after the final oiling.
Even though they say it is not necessary, I think a quick 3000 buff between coats might be beneficial.
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7th June 2018, 05:35 PM #17
I didn't bother photographing the Blackwood. Trust me - it looks like shight.
Black worm holes turn white.
20. White Worm.jpg
As does tear out (which wouldn't normally be there)
21. White worm and tear out.jpg
Fine cracks can become dotted lines because of the high solids.
22. Dotted cracks.jpg
WOP doesn't do any of that (there is a little residual dust or lint). The tear out is just a little darker, and matt finish compared to semi-gloss.
23 WOP cracks.jpg
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7th June 2018, 05:58 PM #18
The critical red wine test
The Ironbark board has been finished for 72 hours, so even though I said I would wait a week (and there is no mention of a "fully cured" time on the can), I thought i may as well have a go. If there is a fail point then i can just repeat from there in 4 days time.
Earlier this arvo I put 5 pools of red wine on the Ironbark, and they are to be left for 10-30-60-120 minutes, and overnight. (also on the Bluegum board)
30. Red wine on Ironbark.jpg
As I was preparing those previous posts I was going down to the shed to wipe up each pool after the number of minutes timed out.
10 minutes - no problem, straight off and feels good
30 minutes straight off, but feels a tiny bit rough in one part of the grain. No stain though.
60 minutes - well I was going to report that this was the fail point, because after I wiped it up the timber still looked a little wet. However, this has now dried out, but is a little rough in the same streak of grain.
120 minutes - not looking too good. Quite obviously a pink stain - will check again when it is fully dry, but this looks like the fail point. However, the Bluegum (a less hard timber) has no stain, wetness or roughness.
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7th June 2018, 06:20 PM #19
Interim conclusion
I think I am inexorably coming to the conclusion that Osmo PolyX RAW is for even more specific purposes than I first thought. I never expected it to look any good on timber darker than blond, but I hadn't counted on the quality of the timber surface being quite so important. That is, if there are any cracks or worm holes they either need to be filled with clear epoxy, or you have to put up with them being white highlights.
Filling the worm holes in this Blackbutt is not to onerous but there are too many cracks to do because the timber is so curly.
So, for a good result where you can't really see evidence of the Osmo, you need:
- Quite pale blond timber (others may work, like the Ironbark, but test check)
- no surface checks or holes
- fine grained timber
- Sand to 240
- Oil
- Maybe a quick buff with 3000 grit if the surface feels a little rough
- Oil
- A quick buff with 3000 grit to finish.
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7th June 2018, 07:36 PM #20Derpaderpa
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This is probably my biggest gripe with hardwax oils - information. OSMO are particularly bad in it - each distributor around the world seems to run off a different set of instructions (US satin is different rest-of-the-world satin, 3054 vs 3032)
From the information I've gathered and some tests I've done in the past, depending on the temperature with PolyX you should wait 8-12 days before "use".
Similar to the off-gassing and crosslinking period for polyurethanes, HWOs seem to "transform" after 8-12 days (Fiddes seems to be 6-8 days) and they'll feel different (better) to touch and be far more resistant. I haven't actually tried it with alcohol, but haven't had issues with water, tea, sugary drinks after that time period. Within 2-4 days, it was prone to water rings if not careful.
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7th June 2018, 07:44 PM #21
Ok, so another test in a week's time (pretty cool here atm).
I just had another look at the 2 hour pool. Colour seems to be back to normal but it is definitely rough to touch. Just the overnite one to check tomorrow.
I was just watching Peter Parfitt testing another Osmo (satin?) and he did a 7 hour wine test almost straight away, with a perfect result. Beats me.
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7th June 2018, 09:59 PM #22GOLD MEMBER
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7th June 2018, 10:49 PM #23
What did you sand up?
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7th June 2018, 11:53 PM #24GOLD MEMBER
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8th June 2018, 11:24 AM #25
I mean what timber?
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8th June 2018, 07:39 PM #26
After the red wine had been on for 24 hours, there was a distinct mark that was quite rough, and upon immediate removal still felt damp. This time the Bluegum also had a slight stain and roughness.
I've brought the piece of Ironbark up to the house so it can cure for a week with a bit of warmth around it. It has dried out now and the visual mark has receded but can certainly still be seen. It is still quite rough to touch.
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13th June 2018, 05:16 AM #27GOLD MEMBER
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18th June 2018, 11:46 AM #28
Saturday marked about 12 days curing so I did the red wine test again, leaving it there for 24 hours.
The result was the same as previous - I can see in the grain holes that there are dark stains, and the grain has lifted up to be rough. I can only conclude that either a third coat is needed (probably not a good idea with translucent finishes), or that the claims of being "red wine proof" are somewhat exaggerated.
If a spillage occurs it would be best to wipe it up within the first 30 minutes. I have to think that the slight acidity of the wine eats at the surface a little which allows the stain to penetrate slightly to the wood. It may be that if the grain was filled before applying the PolyX Raw there might be a different result, but Ironbark is pretty tight grained timber.
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18th June 2018, 06:51 PM #29
Ironbark board with PolyX Raw, but no wine left on it:
IMG_5671.jpg
2-3 days after PolyX, and 24 hours of red wine:
IMG_5670.jpg
12-14 days after PolyX, and 24 hours of red wine:
IMG_5669.jpg
Now if they were floorboards, I wouldn't ve concerned at all, but if it was a table where it is much closer to the eye, and the roughness can be felt, that's different!
However, I'm not going to quit just yet on this $65 can of German technology. This arvo I flipped that board over, sanded it up to 320, did two coats of dilute shellac sanding sealer (which I did not use last time), sanded to 500, and applied a coat of PolyX, which I clothed down shortly after. I will add another 2 maybe even 3 thin coats (as they are after clothing down) and then repeat the wine test in a couple of weeks.
Also, on the right half of the new side, after the sanding sealer I filled the grain with slightly water diluted Timbermate.
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19th June 2018, 07:46 PM #30
After your finest grit are you wiping over with clean water to raise the grain, and then lightly resending with the finest grit you use?
There ain't no devil, it's just god when he's drunk!!
Tom Waits
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