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White areas after Poly?

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Forum topic by BigAndRich posted 08-16-2013 06:15 PM 809 views 0 times favorited 11 replies Add to Favorites Watch
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BigAndRich

26 posts in 470 days


08-16-2013 06:15 PM

Topic tags/keywords: finish oak finishing

Never really done a lot of finishing. Actually this is the first piece. I stained a piece of oak using a blend of MinWax Wood Finishes(2 coats). Let that dry and put on the first coat of Minwax fast drying Poly(clear Satin). I diluted that just a bit with mineral spirits then brushed it on with a sponge brush. Went back to check it after an hour and noticed hazy whitish areas. Not the whole piece, just in sections. Is this normal or did something happen? I’ll try to put some pics up later if I can.

-- Rich, Kentucky


11 replies so far

View TCCcabinetmaker's profile

TCCcabinetmaker

925 posts in 1007 days


#1 posted 08-16-2013 06:20 PM

well it’s probably one of two things…

You either didn’t completely remove sanding dust between coats, or you have humiidity trapped in your finish, which is called blushing. Without seeing, I really can’t tell you, which it is. I know how to get blushing out in lacquer, but not really sure the same approach would work with poly, sorry.

-- The mark of a good carpenter is not how few mistakes he makes, but rather how well he fixes them.

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mporter

235 posts in 1230 days


#2 posted 08-16-2013 06:25 PM

Oak(red oak especially) is extremely porous. When the finish starts to dry, some of the finish leaks back out of these pores and causes the hazy white spots. Very common on oak. Use a filler, or wipe down the piece after 20-30 minutes of drying to get rid of this.

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BigAndRich

26 posts in 470 days


#3 posted 08-16-2013 06:28 PM

-- Rich, Kentucky

View firefighterontheside's profile

firefighterontheside

4274 posts in 509 days


#4 posted 08-16-2013 06:44 PM

To be sure, it did not look like that before the poly went on? From the picture that almost looks like the stain was not accepted due to something like glue or an old finish. Did that have a previous finish on it that you may have sanded off?

-- Bill M. I love my job as a firefighter, but nothing gives me the satisfaction of running my hand over a project that I have built and just finished sanding.

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Richforever

739 posts in 2372 days


#5 posted 08-16-2013 06:50 PM

This happened to me, even over the top of a wash coat of de-waxed shellac. I had to sand it down, re-stain, re-apply the topcoat. The only common factor when this happens is that I used minwax. I don’t use minwax anymore. The Varathane brand at HomeDepot replaced minwax and it is much better.

-- Rich, Seattle, WA

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BigAndRich

26 posts in 470 days


#6 posted 08-16-2013 07:07 PM

@firefighterontheside Nope, definitely didn’t look like that before. Fresh board, sanded, dusted, made sure nothing was put on it. Just two coats of the blended minwax finishes then the first coat of diluted poly. It’s been on there about 3 hours now. Going to let it sit another 2-3 because it’s so humid here right now then sand it and see what happens.
@Richforever Really hope I don’t have to redo the whole thing. Trying to sell the house so I really need to get this installed and done. Besides minwax all we have local is cabot and rustoleum.

I know it’s really humid here right now; like 80+%. Could that have effected it? Could adding the mineral spirits have done it? May have used maybe 1:4 spirits to poly.

-- Rich, Kentucky

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Earlextech

975 posts in 1343 days


#7 posted 08-16-2013 07:13 PM

It blushing. Using a “fast” drying finish and the humidity you’re in caused it. You need to slow down the drying time so the moisture has time to escape before the top coat seals it in. Sand it down, thin 50/50 and try again. if you can, turn on the a/c. Or at least close the garage door, put a fan in a window blowing out, or use a dehumidifier in the room.

-- Sam Hamory - The project is never finished until its "finished"!

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BigAndRich

26 posts in 470 days


#8 posted 08-16-2013 09:05 PM

Well, after attempting to sand a little to see what happens I ended up scraping it all off. Guess I’ll try again. And thanks for the advice there Earlextech. Thanks everyone for the help. Give it one thing, this has definitely been a learning experience. I’ll try again and let you know what happens next time.

-- Rich, Kentucky

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BigAndRich

26 posts in 470 days


#9 posted 08-18-2013 01:42 AM

Well, I have the piece restained and curing. With the humidity here right now some of you said I need to thin my poly so it will have longer dry time. What about using the aerosol poly? Has anyone used that? Would that work? I don’t have the time right now to wait a little and wipe it back down like some suggested. I did try that on some scrap and it seemed to work.

-- Rich, Kentucky

View TCCcabinetmaker's profile

TCCcabinetmaker

925 posts in 1007 days


#10 posted 08-18-2013 02:31 AM

eh, hard to say if the airborne will work better or not, like you said it’s the humidity. I have alot higher constant humidity where I am at, so poly and the difficulty to retard (not thin) poly is kind of a hassle, I’ve spent alot of time in conversations on the phone with people like minwax, who can’t give out retarding/thinning information because it is apperently illegal for them to do in california, which I am in… Alabama…

-- The mark of a good carpenter is not how few mistakes he makes, but rather how well he fixes them.

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BigAndRich

26 posts in 470 days


#11 posted 08-18-2013 01:22 PM

@James101 I let it dry for days. No more tackiness and then I let it sit a couple more days.

So instead of thinning it, what do I need to do to retard the drying process?

-- Rich, Kentucky

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