15#ceramistpalace / @2 e/ i! u y3 p8 E/ o9 r ) L6 i) ~3 v" x5 m+ @8 o, S ' z0 q2 U& l0 n" g. J( c/ |3 W$ \My husband seals the plastic layers himself, then use a small fan to blow air between the two layers. The plastic can only be bought at Horticulture supply stores.