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Mysterious Spots after Staining

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Forum topic by Cuddy8888 posted 08-13-2019 03:19 AM 217 views 0 times favorited 3 replies Add to Favorites Watch
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Cuddy8888

1 post in 12 days


08-13-2019 03:19 AM

Topic tags/keywords: stain issues problems stainproblems redoak oak

I am.staining red oak with old masters oil based American Walnut stain. This mysterious spot appeared after I stained the wood that was not visible before. I sanded it to 220 before applying the stain. I made sure there was no dust or anything on the wood before staining. I applied the stain with a staining pad ensuring to wipe off any excess. Results looked great initially until this spot appeared about 20 min later. It was about 84 degrees and 70 percent humidity when I applied the stain. Could it be the heat? Any tips on a fix?

Thanks


3 replies so far

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a1Jim

117690 posts in 4032 days


#1 posted 08-13-2019 04:06 AM

Hi Cuddy
Welcome to Ljs I would guess what’s happening is that your getting what’s called push back (excess stain popping out of the open grain of your oak) It happens when your a little heavy-handed with the finish, also keep in mind the finer you sand it the less finish get’s into the grain ,With oak sanding to 150 or 180 is fine enough.

https://www.artisticwoodstudio.com/videos

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OSU55

2381 posts in 2444 days


#2 posted 08-13-2019 12:00 PM

Caused by the grain in that area absorbing more of the dye part of the stain. From the shape of it some type of liquid was covering that area which opened up the grain. Try wiping with naptha and some more sanding. Dont think it needs fully but you need to sand through the disrupted grain. May take several attempts.

Or, it looks like the stain was allowed to spill onto the wood and dry after your stain coat, any way that could have happened?

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4wood

22 posts in 408 days


#3 posted 08-14-2019 01:59 AM

I had something very similar thing to that happen to me several years ago and it took a while to figure it out. We were working in a hot shop and my friend rested his forearm on a panel that we were ready to stain. After the stain was applied a darker spot with a similar shape as yours appeared. I believe the cause was that his forearm was wet with sweat and it water popped the grain causing it be darker in that spot. This is a common problem in the wood floor finishing business. The finishers need to be careful not to let any sweat drip onto the floor because it will show up as dark spots.

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