As you can see in the picture the kitchen cabinet doors shows water stains. A local Home depot guy told me that I need to sand it down and apply polyurethane finish. So, I did it, but it doesn't look good at all. I wonder if any of you have any suggestions how to get rid of those water stains without stripping the whole door and refinish it.* Thank you,*
after you cleaned the surface with 409, were the water spots still noticeable ?
and - did you come back with a clean wet cloth and remove the 409?
and - after you sanded the areas in question, did you still see the spots ?
just trying to figure out the chain of events here.
after you cleaned the surface with 409, were the water spots still noticeable ?
Yes,
and - did you come back with a clean wet cloth and remove the 409?
No, I didn't. I just cleaned it with dry cloth.
and - after you sanded the areas in question, did you still see the spots ?
The spots were gone, but the area I sanded looks a little lighter than the other area (original finish) after I applied polyurethane finish.
just trying to figure out the chain of events here.
Oxalic acid, or TSP would probably be good for this. Use it before you do any sanding. On really bad stains, may take a few applications to completely remove the stains.
Sorry, but you may have to strip the new finish so the oxalic acid can penetrate.
P.S. I highly recommend that you do some research online before fully taking "knowledgeable" advice from the store. I'm not going to blanket say that no one is knowledgeable, but they are there to sell products, and can't be expected to know about all the products and how they're used.
Oxalic acid, or TSP would probably be good for this. Use it before you do any sanding. On really bad stains, may take a few applications to completely remove the stains.
Sorry, but you may have to strip the new finish so the oxalic acid can penetrate.
That's ok. Thank you for info. I will try that to see how it turns out.
If you are convinced that the white stain is in the finish itself, care fully applied heat might just get rid of the white. Carefully applied heat will sometimes melt the finish, dry it and then harden back up again.
It is quite possible that the white areas are actually a mold or fungus caused by moisture UNDER the finish and actually on the wood itself. This mold/fungus is usually harmless to humans but it has somehow removed or bleached the color out of the wood. If this be the case, there is no cleaning agent that will replace the color of the wood.
I think the only way to find out for sure is to sand down below the original hard clear coat finish. Then touch-up with stain or touch-up powders. They also might have touch-up marker that get get a close color match.
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