Saturday, July 12, 2014





YOUR PLACE ALAN J. HEAVENS


May 03. 2013 7:22PM


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Q: Our house was fitted with white aluminum siding by the prior owners decades ago. We’ve been in it about 16 years now.


The siding has held up OK except in the front above the porch, which gets the morning sun. It is losing its paint. Is there a preferred method of dealing with this?


A: Yes there is. And for advice about anything paint, I turn to the experts at the Paint Quality Institute in Spring House, Pa.


First, how should you prepare old aluminum siding before painting? And what type of primer is the best for siding?


Remove as much chalk, dirt and mildew as you can. Chalk is powdery pigment on the surface of weathered siding that comes off when you rub the palm of your hand over it.


Removal is done by power washing or by scrubbing and rinsing.


The only times a primer would be needed are if any bare aluminum is exposed or if there is still much chalk left on the surface.


In the first situation, remove any white oxide with a nonmetallic scouring pad such as ScotchBrite, then wash off and rinse to make way for a latex corrosion-inhibitive primer. In the second scenario, apply a quality exterior alkyd — “oil-based” — primer recommended for aluminum siding by the manufacturer.


One consumer asked the institute experts whether he should wipe the siding with mineral spirits before priming, having had to use a sander to remove road salt from the surface that was now badly pitted.


The answer is no — unless you have some oily contaminant such as road tar on the siding. The road salt removed was probably white aluminum corrosion (aluminum oxide).


If you do prime everything, you will get a more uniform appearance from the paint, compared with if you only prime some parts.


Here’s a great resource: Bookmark the institute at www.paintquality.com.


•••


A FAMILIAR TOPIC: Chicago reader Sam Portero wrote to weigh in on discussions concerning how to get rid of lingering cat-urine odors in the basement.


He said the house he and his partner owned before they bought their current condo had the same cat-urine issue.


Locating the affected area was difficult, but they found it was concentrated in one area, Portero said.


“After trying all kinds of solutions, we finally went to a pet store and bought a product for removing urine odor that was an enzyme-eating solution,” he said.


“Two gallons at full strength, applied slowly, and in liberal doses to allow it to seep into the affected area without running off eventually did the trick in a couple of weeks.”


“It does takes time for it to work,” Portero said, “but that enzyme did seem to be the key. Most everything else was just a cover-up.”




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