Basement windowsill painting


  #1  
Old 01-17-17, 06:37 PM
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Basement windowsill painting

Hi all. I am painting a wooden windowsill, never painted before. Unfortunately it occasionally came into contact with moisture. I used Zinsser mold covering primer to start, just in case. I then used a second coat of primer, this one Zinsser 123. I then put a coat of (white) SW Proclassic Enamel. It wasn't covered well at that point, so I added another coat of Zinsser 123, and the photos reveal my current results.

Seeking any sage advise! I am determined to win, but as determined to learn how to handle this!

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  #2  
Old 01-17-17, 08:09 PM
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Sadly, I think this is a case of painting too many coats over a waterborne stain on a surface that was not proper prepared, and the primer was not the right kind for the stains that needed to be covered. Personally I would suggest you strip the paint with a chemical stripper (like 2 minute stripper) and a putty knife and start over.

To sucessfully paint, wood should be clean and dry... if the wood got wet at some point, it could have had mold, or at the very least, tannins that leached out into the paint and primer. Not all primers are the same... some are superior to others.

Once you strip the wood, you will need to sand it. (120-150) Since you know the wood is stained, you might consider bleaching it (oxalic acid) to get as much of that stain out as you can. Follow that with the sanding. Then oil based primer, like Kilz original. (Not latex and not kilz 2 or 123). Lightly sand the primer with 220 grit, then one coat of your Proclassic should cover.
 
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Old 01-18-17, 08:31 AM
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X nailed it - need an oil based primer over clean, dry wood.
 
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Old 01-18-17, 08:41 AM
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Stripping and starting over would be ideal although a quick fix would be to apply an oil base or pigmented shellac primer over the stains and repaint.
 
 

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