Quote:
Originally Posted by wanderingturtl
Someone talk me out of using roofing tar for lower window corners.
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What do you mean by the word "tar"? Tar is a generic term that is usually used to refer to bitumen, aka asphalt, or coal tar pitch, which is very brittle when solid. Both are hydrocarbons and will burn or melt at lower temps. I believe you actually are refering to plastic roofing cement which is asphalt + various additives mixed with a solvent and possibly fibers, to help prevent cracking and doesn't require heat to apply.
Reasons for not using it are.... it sucks to work with, is very difficult to seal metal with because metal expands and shrinks with temp changes much differently than the plastic cement which is not very flexible, doesn't play well with paint or caulks, cracks, and is a pain to remove. You need some type of flexible caulk to deal with aluminums high thermal coefficient of expansion. It helps if the caulk is paintable to conceal flaws
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