No, foil has poor reflective qualities and can cause 'hot spots' that can burn your plants. You're better off using something white if you can't get ahold of mylar....flat white (like flat white paint) is best.
Weedhound Reviewed by Weedhound on . Mylar alternative? If you cant get ahold of mylar could you use tin foil on cardboard? and yeah ive looked around a lil to find this with no luck Rating: 5