>> Condensation on the inside windows. I hate it. How do I get rid of it?
>> What's the cause of it? Why does it take so long to remove with the
>> defroster? How can I seal up the outside of my car. What's the best way to
>> check for air/water infiltration. Ugh. Help!

Check that you have the HVAC controls to get air from outside, not just
recirculate interior air. All of the moisture in your breath, and that of
your passengers, will condense on the windows if you just recirculate the
interior air.
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Alex