Reflective paint

If you read the description, it says that it's actually a clear, semi-transparent coating. You would still need to paint your walls white. One spray paint only covers 15 sq ft. so it will cost you a lot. I think if you just paint your walls flat white you will be very happy.
 
Use flat white Kilz paint. It has mold barrier in it and flat white is about 90-95% reflective. Only slightly behind new, clean mylar (which drops dramatically after installation).
 
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