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Old 08-24-2008, 07:53 PM   #1
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Inexperienced paint questions


I recently retired and decided to paint our large bay window in the front of the house. Caulked it well and sanded where needed. Used Porter paint - professional grade which I have used before on this same bay window, no problems. Painted on a hot day 95 degress(Atlanta, GA). 3 days later it rained and I have quite a few small, tiny bubles in different areas of the window - with quite a few where new caulk was applied.

What did I do wrong and how do I fix. It almost seems like it wasn't fully dried however there was 3 days of good weather before the rain.

Also, whenever I sand areas, I never do a god job of filling in the sanded areas so they do not show - sometimes 5 or 6 coats and the sanding indentation is still visible. How do I improve on this.

Thanks for the help
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Old 08-24-2008, 08:50 PM   #2
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Inexperienced paint questions


Well, 95* is too hot, and bubbles almost always means moisture
Could there be moisture seeping in and hanging out around the window somewhere?
Like inside the wall?
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Old 08-24-2008, 08:59 PM   #3
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Probably, you painted when the surface was TOO hot.

Here, go to this web site:
http://www.paintquality.com/index2.html

Click on "Solve Your Paint Problems" in one of the grey boxes.

Click on the pink "Exterior" link

In the "Exterior Problems" drop down list, click on "Blistering"

Does your paint look sumthin like that?

Part of the text reads:

POSSIBLE CAUSES:
  • Painting a warm surface in direct sunlight.
  • Application of oil-based or alkyd paint over a damp or wet surface.
  • Moisture escaping through the exterior walls (less likely with latex paint than with oil-based or alkyd paint).
  • Exposure of latex paint film to dew, high humidity or rain shortly after paint has dried, especially if there was inadequate surface preparation.
Probably it's that "painting a warm surface in direct sunlight" that's the catch. Can you paint earlier in the morning or later in the evening, or under the shade of a large umbrella?
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Old 08-25-2008, 09:04 AM   #4
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Inexperienced paint questions


Did you make sure to use paintable caulk?

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Old 08-25-2008, 09:59 AM   #5
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Inexperienced paint questions


My guess was the caulk too - Silicone caulk will not usually take paint unless its a special stuff. If using silicone you should caulk after painting with a color matched caulk (or white or whatever). If caulking first it should be a paintable caulk.
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Old 08-25-2008, 07:20 PM   #6
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...didn't occur to me about the caulk, as "silicone" is a bad word in my world
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