Yes it will reflect more light if smoothed down, for a few bucks more you can buy a material better than mylar called reflectix it is textured and stiffer so it does not blow around and make noise like mylar. :thumbsup:
BONG0 Reviewed by BONG0 on . Mylar Question Does it have to be completely flat against the wall? i have it taped up and i didnt try and flatten the mylar out, its really loose and moves when the fans blow on it... and now that i think about it, it would probably reflect more light if layed flat against the wall... any opinions on this? Rating: 5