disappearing water marks


blessed grandma

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Sounds like it could be shellac, which is still available. But it is generally not a good finish for table tops because it is suseptable (as you know) to water marks. It is also sensitive to heat & alcohol will dissolve it. Polyurethane is very tough, hard wearing & won't stain with water.

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As a bonus, if the existing finish really is shellac, you can coat poly right over it. Shellac is considered a "universal" binder / sealer, as most other finished adhere to it well. You can try rubbing a rag dampened with alcohol on an inconspicuous spot under the table top. If the finish rubs off, you can be pretty confident it is shellac. A light sanding is all you would need to top coat it with polyurathane.

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On 2/27/2020 at 12:22 PM, drzaius said:

Sounds like it could be shellac, which is still available. But it is generally not a good finish for table tops because it is suseptable (as you know) to water marks. It is also sensitive to heat & alcohol will dissolve it. Polyurethane is very tough, hard wearing & won't stain with water.

Thank you so much for this helpful information. I visited a great aunt and cousin in Calgary in 1955 and attended the Stampede.  Beautiful up there and enjoyed the pancakes given out from chuck wagons on the streets.

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On 2/27/2020 at 7:41 PM, wtnhighlander said:

As a bonus, if the existing finish really is shellac, you can coat poly right over it. Shellac is considered a "universal" binder / sealer, as most other finished adhere to it well. You can try rubbing a rag dampened with alcohol on an inconspicuous spot under the table top. If the finish rubs off, you can be pretty confident it is shellac. A light sanding is all you would need to top coat it with polyurathane.

Thank you so much for this very helpful information, I will try it.

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21 hours ago, blessed grandma said:

Thank you so much for this helpful information. I visited a great aunt and cousin in Calgary in 1955 and attended the Stampede.  Beautiful up there and enjoyed the pancakes given out from chuck wagons on the streets.

Ya, no shortage of free food at Stampede time. It's quite a bit bigger now than it was in '55.

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