Message text written by "BP - \"Infarct a Laptop Daily\""
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With a 12 year gap, how long would the newly coated portions take to catch
up? Would that have to wait until the first cleaning? On a related topic, I
wonder if the nature of airborne grime has remained constant in this era of
cleaner burning vehicles and smokestack scrubbers on coal fired power
plants.
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How long it will take to catch up is impossible to predict with any
accuracy, but it will make an interesting study, won't it? A white precast
concrete building in Boston that we worked on in 1985 or so, had patches
matched to the brilliant white clean cross-section instead of the soiled
face of the building. It looked like hell for 10 years until it all got
dirty enough to "blend".

Mike E.