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Old 06-28-2010, 06:13 PM  
jimmy50
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Default Drink glass leaves a ring on a wood coffee table

I've always been a die-hard user of coasters when setting a drink down on virtually any type of surface. However, the other day a friend of mine put his glass down on a wood coffee table of mine without using a coaster and it left a ring in the shape of the bottom of the glass. I tried just wiping it off w/ a paper towel but no luck. Anyone have any suggestions so I don't have to refinish the entire table top?

Thanks guys!



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Old 06-28-2010, 10:41 PM  
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Believe it or not, that's something similar to a clowd you're seeing inside the finish on your coffee table.

Individual water molecules migrated into the finish and collected in tiny voids where sufficient space existed for extremely tiny droplets of liquid water to form. So, that white spot's closest analogy would be a "clowd". And, it's white for exactly the same reason that clowds and snowbanks and water falls and the head on a beer are all white, even though nothing inside any of these things is white in colour.

Anyhow, just warm the area with a hair dryer to cause the water droplets to evaporate into H2O molecules, and they should find their way back out of the finish. Don't get the finish very hot, as that might cause the finish to get so soft that the evaporation of the water could cause the surface to blister. Just warm like it would be in the hot summer Sun to promote the transformation of the water droplets into water vapour so they can escape from the finish. What's preventing them from leaving now is the attraction between water molecules that causes them to stick together. You have to add heat to cause them to leave the group and migrate through the finish as individual H2O molecules, just like they went in.

Some people suggest using a hot iron and soft cloth to do this kind of work, but if I were doing it, I'd use a hair dryer because it would allow me to see what's happening as I'm using the dryer. With a hot iron and cloth over the clowd, you can't actually see what's happening until you remove them. A hair dryer gives you visual feedback while things are happening.



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Old 06-29-2010, 12:56 PM  
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Hair dryer will do, like he said, simple one and done... or iron and towel, but I think the hairdryer method is easiest.

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Old 06-30-2010, 01:24 PM  
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yup - worst think you can do is to try and "clean" the ring off. That will remove some finish and make the damage permanent. The ring might just dry on its own too.

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Old 06-30-2010, 03:14 PM  
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Does anyone know which wood finishes are susceptible to water marks?

I've been told it's only nitocellulose lacquer. So far as I know, neither drying oil based "varnish" nor alkyd based polyurethane are susceptible to water marks.

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Old 07-02-2010, 01:50 PM  
jimmy50
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Thank you everyone!! This sure was easier than I thought!! Appreciate all the help!

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Old 07-02-2010, 08:22 PM  
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Jimmy, which method did you try and how did it turn out?

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Old 08-04-2010, 10:48 AM  
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I put a dry cloth down and set my iron on a low/medium heat and worked it over the surface and voila...thanks guys!

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Old 08-17-2010, 04:11 AM  
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i'm so glad i dropped by here in this forum..
i have no idea that you can use either hair dryer or iron and cloth to remove that clowd..now i know..

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Old 08-19-2010, 01:21 PM  
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Glad this helped you too keikoling!!



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