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Mineral Spirits and Poly Problem

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Forum topic by BinghamtonEd posted 770 days ago 2067 views 0 times favorited 28 replies Add to Favorites Watch
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BinghamtonEd

1243 posts in 995 days


770 days ago

Topic tags/keywords: question

So I went do to HD the other day, grabbed some Kleen Strip Oderless Mineral Spirits (NOT the green eco-friendly junk), and a can of MinWax oil-based poly. I mixed them 50/50 and put down a coat on some 1/2” dyed birch ply. When it dried, I noticed that the finish has spots in it of white. So I sanded down, did it again, same issue. So I put this finish on once piece, and then do straight 100% poly on another piece. Once its dried and hardened, I see the white spots in the piece with the mixture, and the one with straight poly looks fine. So I can reasonably assume that my poly is OK. Why would the 50/50 mineral spirits mix cause this? I’ve made wipe-on poly before and not had this issue.

-- - The mightiest oak in the forest is just a little nut that held its ground.


28 replies so far

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A Slice of Wood Workshop

890 posts in 1799 days


#1 posted 770 days ago

Are they white spots or little air bubbles?

-- Tim- http://www.asliceofwoodworkshop.com; Twitter-@asliceofwood; Facebook-http://www.facebook.com/asliceofwood

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A Slice of Wood Workshop

890 posts in 1799 days


#2 posted 770 days ago

Do you have any pictures?

-- Tim- http://www.asliceofwoodworkshop.com; Twitter-@asliceofwood; Facebook-http://www.facebook.com/asliceofwood

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BinghamtonEd

1243 posts in 995 days


#3 posted 770 days ago

white spots, sorry no pics, will try to get some tonight. They’re just a flat dull white.

-- - The mightiest oak in the forest is just a little nut that held its ground.

View bondogaposis's profile

bondogaposis

2480 posts in 977 days


#4 posted 770 days ago

I try to stay away from Minwax. Is it possible that you may have introduced some contamination during the mixing process?

-- Bondo Gaposis

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BinghamtonEd

1243 posts in 995 days


#5 posted 770 days ago

I don’t think so, I mixed the poly in the can with a clean stir stick. I poured the poly and MS into a clean, dry plastic paint cup, mixed the MS in with the same stir stick. Straight poly coat came right out of the can.

-- - The mightiest oak in the forest is just a little nut that held its ground.

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Mosquito

4594 posts in 918 days


#6 posted 770 days ago

Take a look at the Mineral Spirits, inside the jug/bottle. I had the same stuff, and at the bottom was a white milky (slightly thicker than milk) residue. Maybe you have some of that in yours, and it’s getting into the mixture? I’m not sure if it was there the whole time for mine, but I noticed it more once it started running out. I only used mine to clean up, though

-- Mos - Twin Cities, MN -- Stanley #45 Evangelist - www.youtube.com/MosquitoMods

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dlmckirdy

195 posts in 1759 days


#7 posted 770 days ago

I’ve had the same problems with Kleen Strip mineral spirits. I think it has to do with their low/no volitile hydrocarbon formula. I went to my LOCAL paint supplier and bought traditional miner spirits and solved the problems. The owner of the store/paint company said he gets the same complaints about Kleen Strip regularly.

-- Doug, Bakersfield, CA - I measured twice, cut it twice, and it is still too short!

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Mainiac Matt

3874 posts in 954 days


#8 posted 770 days ago

I think Doug is on the right train of thought….

“Odorless” mineral spirits can also be labeled “white” mineral spirits…. and I got a can a year ago that was just that…. white.

What Chris probably saw was a can that had been on the shelf a long time and whatever makes it white was settled down to the bottom.

I’m guessing that this stuff was tailored to artists and others who work with oil paints in doors and don’t like to stink up their studios with solvent smells.

Use that can to clean paint brushes and get some plain old, cheap and stinky “paint thinner”

+10 man points to Ed for not whimping out and asking for help (aka directions) untill after he botched the finish twice! Keep doin’ us proud brother :^)

-- Pine is fine, but Oak's no joke!

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BinghamtonEd

1243 posts in 995 days


#9 posted 770 days ago

Lol thanks ssnvet. It’s my software engineering background coming into play ” “Huh, didn’t work? OK, try it again. Still no. OK, try it again. Still not working? ...”

-- - The mightiest oak in the forest is just a little nut that held its ground.

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EPJartisan

1052 posts in 1751 days


#10 posted 766 days ago

Have you tried naptha? Mineral Spirits just has too much junk in it for me.. I only use it as a cleaner. Naptha mixes really well with Poly.

-- " 'Truth' is like a beautiful flower, unique to each plant and to the season it blossoms ... 'Fact' is the root and leaf, allowing the plant grow and bloom again."

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Ktrumble

17 posts in 537 days


#11 posted 537 days ago

I think I am having the same problem. Did it look like this? Did you end up stripping it or applying 100% poly?

View camps764's profile

camps764

785 posts in 986 days


#12 posted 537 days ago

yikes! That looks like a gorgeous piece Ktrumble – except that nasty spot.

Glad I read this thread…will keep using the stinky stuff.

I actually don’t mind the smell of mineral spirits – sort of like when i was a kid I loved the smell of gasoline…

which might explain some things about me I suppose.

-- Steve. Visit my website http://www.campbellwoodworking.com

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Ktrumble

17 posts in 537 days


#13 posted 537 days ago

I too used the non stink min spirits. I also still like the smell of gasoline.

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Ktrumble

17 posts in 537 days


#14 posted 537 days ago

Here is the rest of the table. I also learned that you really need to wait until Danish oil dries before applying poly. I had a ton of bubbling. We also had a lot of rain, so clearcoat took 3-4 days to dry. I hate finishing, but I can’t be impatient now after all the work I put into the piece.

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Ktrumble

17 posts in 537 days


#15 posted 537 days ago

This one literally had blood, sweat, and tears in it. Stabbed myself with a chisel, causing three stitches. My wife didn’t understand why I stopped the bleeding, then immediately went back to the shop to scrub the blood off the table before going to the ER. I still can’t feel the end of my finger.

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