Hi Fred,
Here is a link to the stuff I was talking about. They claim 95% reflective for heat.
It could save a bunch of time compared to the bits and pieces of mirror method - not to mention it's not fragile either!
http://www.cleardomesolar.com/
btw I have not tried their product yet but it looks good.
more reading:
http://www.washingtonfreepress.org//11/Solar.html
Have Fun!
Ted.
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