Quote Originally Posted by Dazed4now
go get some mylar from a sporting good store (its packaged as an emergency space blanket usually)
Good call!

Another cheap (usually free) grow-room liner: advertising posters! The backs are shiney white: better than foil & white paint, almost as good as mylar. liquor stores are always throwing out beer posters. Flip 'em over, shiney side out, staple/tape up, and voilá! (I'm a cheap bastard)