I have been using foil as a reflector and now know this is bad idea I see alot of talk about mylar and the fact that it can be found at home depot. My question is what is it for I mean why do they have it at home depot so i know where to look. thnank you . Also another mylar product people use , wrapping paper, what kind is it ...what am i looking for. I have searched this site and I couldnt seem to find this particular info.