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any idea what could cause these streaks in the polyurethane?

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Forum topic by Frankfort posted 05-08-2021 11:40 PM 999 views 0 times favorited 21 replies Add to Favorites Watch
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Frankfort

48 posts in 87 days


05-08-2021 11:40 PM

I finished two other pieces of Hickory with absolutely no problem.

I first put linseed oil on these and let them dry for a day. The poly had streaks in them so I sanded the polyurethane off and re oiled the Hickory.

So this time I left the oil dry for three days thinking that that was what caused the streaks.

I also tested this can of finish on other pieces with no problem.

Streaking again. So I’m starting to get pretty frustrated with this because this clear satin wipe on poly has always been really easy to work with.

Solutions?

Thank you


21 replies so far

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1thumb

445 posts in 3279 days


#1 posted 05-08-2021 11:49 PM

IDK, but the grain is beautiful

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Frankfort

48 posts in 87 days


#2 posted 05-08-2021 11:52 PM



IDK, but the grain is beautiful

- 1thumb

Thanks! All the more reason I’m frustrated, lol.

The other pieces finished just fine.

Also, what grit sandpaper would you use to remove the poly if I was trying to salvage the oil?

It was a huge pain to sand down everything and redo it all.

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Andybb

3319 posts in 1727 days


#3 posted 05-09-2021 12:01 AM

`So, no oily residue from anything it was exposed to like wax or some other oil.

-- Andy - Seattle USA

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1thumb

445 posts in 3279 days


#4 posted 05-09-2021 12:03 AM


IDK, but the grain is beautiful

- 1thumb

Thanks! All the more reason I m frustrated, lol.

The other pieces finished just fine.

Also, what grit sandpaper would you use to remove the poly if I was trying to salvage the oil?

It was a huge pain to sand down everything and redo it all.

- Frankfort


I’d also be frustrated. I’m not a finisher so can’t answer. If you did all the same but only one streaked, sanding dust left on surface maybe?

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LesB

3013 posts in 4566 days


#5 posted 05-09-2021 12:08 AM

Something slowed down the curing of the linseed oil….was it old?
First thing is let it cure longer and/or add a coat of clear shellac to seal the oil in.(Zinssers clear coat) Let is dry over night and then add you poly.

-- Les B, Oregon

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Frankfort

48 posts in 87 days


#6 posted 05-09-2021 12:31 AM



`So, no oily residue from anything it was exposed to like wax or some other oil.

- Andybb

Not that I can think of.


Something slowed down the curing of the linseed oil….was it old?
First thing is let it cure longer and/or add a coat of clear shellac to seal the oil in.(Zinssers clear coat) Let is dry over night and then add you poly.

- LesB

What do you think, think I’ll have to re-oil it? Or do you think I can sand off the old poly and do the shellac-hack?

And no, it wasn’t old. That’s why I feel like I’m taking crazy pills – same poly, same oil, everything is the same it’s just streaking.

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Frankfort

48 posts in 87 days


#7 posted 05-09-2021 02:02 AM

Ok here’s what I did, I stripped the old poly with 220 grit and wiped them down with mineral spirits.

So it looks to me like I can salvage the oil but what would you recommend as far as dry time at this point? Should I start the count over and go 1 week to be safe?

After all the recommended 72 hours didn’t seem to be enough.

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CWWoodworking

1903 posts in 1302 days


#8 posted 05-09-2021 12:17 PM

Have you tried it without linseed oil? I doubt it looks much different.

How many pieces do you have to finish? Might want to look at other types of finishes that are easier and yield better results in hours instead of days.

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SMP

4197 posts in 1029 days


#9 posted 05-09-2021 02:34 PM

This is why I buy Arm r Seal, its oil and poly mixed. So looks as good as BLO and then poly, but in a single step.

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Frankfort

48 posts in 87 days


#10 posted 05-09-2021 05:08 PM



Have you tried it without linseed oil? I doubt it looks much different.

How many pieces do you have to finish? Might want to look at other types of finishes that are easier and yield better results in hours instead of days.

- CWWoodworking

4 total. But 2 are done already so I don’t want to give up just yet, ideally all pieceswillmatch. I think if I give it more cure time it’ll be ok. At least Les seems confident that was the issue, (and I trust him because you guys know more about this stuff than I do)


This is why I buy Arm r Seal, its oil and poly mixed. So looks as good as BLO and then poly, but in a single step.

- SMP

Yep, I agree. Searched high & low for it before I got started with no luck. Even tried specialty stores.

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therealSteveN

8009 posts in 1697 days


#11 posted 05-09-2021 06:16 PM


This is why I buy Arm r Seal, its oil and poly mixed. So looks as good as BLO and then poly, but in a single step.

- SMP

Ding Ding Ding, we have a winner. I’ll let the professional finish people do the mixing for me too. I’ll admit to rank amateur status, but darned if using those GF finishes I couldn’t fake you out.

Your choice. Gallon, Quart, or pint.

https://www.amazon.com/General-Finishes-ASQT-Arm-R-Seal-Urethane/dp/B00ANLI2HY

-- Think safe, be safe

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SMP

4197 posts in 1029 days


#12 posted 05-09-2021 06:20 PM

Seal, its oil and poly mixed. So looks as good as BLO and then poly, but in a single step.

- SMP

Yep, I agree. Searched high & low for it before I got started with no luck. Even tried specialty stores.

- Frankfort

Where do you live? Rockler, Woodcraft, and even some actual paint stores carry it or can order if they sell any GF finishes.

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bilyo

1370 posts in 2226 days


#13 posted 05-10-2021 06:25 PM

I understand your desire to stick with the same materials and process. I think that you need to allow the Linseed oil to dry a much longer time; maybe a week. However, you might try adding some japan drier to it so that it will dry more quickly. Try it on some scrap first to see if it works for you. I have done this successfully with blo, ms, poly mixes.

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Frankfort

48 posts in 87 days


#14 posted 05-10-2021 07:00 PM



I understand your desire to stick with the same materials and process. I think that you need to allow the Linseed oil to dry a much longer time; maybe a week. However, you might try adding some japan drier to it so that it will dry more quickly. Try it on some scrap first to see if it works for you. I have done this successfully with blo, ms, poly mixes.

- bilyo

Yea, that’s right! I remember you saying that. Where do you buy that?

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SMP

4197 posts in 1029 days


#15 posted 05-10-2021 08:35 PM



Yea, that s right! I remember you saying that. Where do you buy that?

- Frankfort

Pretty much any hardware store, big box store or paint store carry it. Even some Walmart’s carry it.

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