I never heard that before. If you are trying to use Mylar as a wall I guess he is right.
Zandor Reviewed by Zandor on . White Black White? Was wondering if anyone can help? I went to buy some Mylar the other day and was told that if my growroom isn't totally free from outside light then Mylar is pointless. The guy said that you need to put white black white on 1st to make sure all gaps from external light are covered and then put Mylar on. Any advice much appreciated Rating: 5