Aluminum foil is about the worst thing you could use. I mean, flat black paint is worse but Al foil is pretty bad- that's bush league shit.

Try flat white paint. That's close to the reflectivity of mylar and cheap. So are the emergency blankets Ciggies mentioned.
stinkyattic Reviewed by stinkyattic on . mylar substitute? hello, i couldn't find mylar anywhere and i can't paint the walls of my growcloset, so instead I bout this shiny metallic silver paper at an arts and crafts store. Was this a waste of money? should I even hang it up? and for some reason I feel like if i use this paper im gonna start a fire or something, has anybody else used metallic paper like this? also is there anything else i could use for the walls besides mylar and white paint Rating: 5