Message text written by "BP - \"Infarct a Laptop Daily\""
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>How do they say this stuff will hold up to long term exposure when wrapped
on
>a structure?
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They count on UV and water protection provided by vinyl siding, I suppose,
both being rather questionable. I gave my sample of Rwrap to a student,
otherwise I'd try vinegar (acid rain) on it.<

The vinegar/acid rain equation puzzles me. Is there a test method I've
missed? (entirely possible, given the rate at which these things sometimes
develop).

Vinegar, acetic acid, is an organic acid that I would not normally expect
to be a component of acid rain. Acid rain is generally mostly sulfuric acid
and results from the burning of fuels containing sulfur. I have seen heavy
duty industrial epoxy coatings withstand continuous immersion in dilute
sulfuric acid, but totally come apart in acetic acid. We should constantly
question whether a test method accurately reflects what will happen in the
real world, because some methods have been proven to do that very poorly.

Mike E.