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A little finish repair help needed

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Forum topic by Shopsmithtom posted 1915 days ago 746 views 0 times favorited 6 replies Add to Favorites Watch
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Shopsmithtom

780 posts in 2797 days


1915 days ago

Topic tags/keywords: finish repair question

I thought the finish on my oak computer desk (that I did not build) was polyurethane & not subject to that foggy whitish moisture mark, but after putting a pizza on it’s cardboard plate on the desk after it came out of the oven, I realized that it was a bad idea. The warmth & moisture condensation caused the old white (pizza shaped) mark.

Although I remember reading somewhere how to deal with it, It escapes me now that I have a problem. I’m looking for a way to get the white out without having to re-finish the desk. The finish has not picked up, just gotten cloudy. Can anybody help? Thanks. -SST

-- Accuracy is not in your power tool, it's in you


6 replies so far

View Douglas Bordner's profile

Douglas Bordner

3961 posts in 2666 days


#1 posted 1915 days ago

While I haven’t used this product, I gave had luck with other Liberon products. I too remember a tip posted here, but I can’t recall it now.

Anybody else remember?

-- "Bordnerizing" perfectly good lumber for over a decade.

View tenontim's profile

tenontim

2131 posts in 2346 days


#2 posted 1915 days ago

I’m not a big poly fan, but I’ve been told that you can warm poly and rub it into the old finish and it will repair any damaged spots. This is if you have poly on the desk. Might be worth a try.

View Sam Yerardi's profile

Sam Yerardi

244 posts in 2497 days


#3 posted 1915 days ago

The white ring you are seeing is caused by moisture, typically in the outer-most portion of the finish. Whether or not you have a high gloss finish will determine how you need to fix it. There are a couple of things you can try. The first, the easiest, but CAUTIOUSLY, use a hair-drier on the lowest setting and warm the spot up a bit, but NOT ENOUGH TO CAUSE THE FINISH TO BUBBLE. Very slight warmth for a short period of time will help the moisture migrate out of the finish. Another approach, if it was caused by alcohol, is to use a few drops of ammonia on a damp cloth. Both of these methods are intended for surfaces that are not high gloss.

A high gloss finish may require addressing the entire finished surface.

Hope this helps.

-- Sam

View a1Jim's profile

a1Jim

112000 posts in 2179 days


#4 posted 1897 days ago

Sam has a good approach one old approach is to rub some mayonnaise on the circle sometimes the oil in the mayonnaise will help get rid of the ring.

-- http://artisticwoodstudio.com Custom furniture

View Durnik150's profile

Durnik150

647 posts in 1924 days


#5 posted 1897 days ago

Hmmmmm, I learn something new every day here! Honey, bring the Mayo!!

-- Behind the Bark is a lot of Heartwood----Charles, Centennial, CO

View  Box 's profile

Box

4937 posts in 1910 days


#6 posted 1897 days ago

Mayonnaise on pizza?

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