Hey AB can I suggest getting to a mega store and getting an emergency space blanket.(silver thing) They are a few bucks here in the states and are true mylar. The shit is thin but if you reinforce the edges with tape you will be straight.
The shit in your cabinet is bottom grade and you would be well served with mylar considering you don't have light to waste.

Peace and keep tuning it in -Jay
CaliJay Reviewed by CaliJay on . Flowering log... With pics... Okay, I put my plants into 12/12 about 6 days ago, and last night one popped out with tiny thin little pistils, so its a girl! :dance: The other has a load of leaves clustered together at the top which looks to me like its also gonna be a girl, they are different strains so they will show sex at different times. The plant that has been confirmed as female has a small rust problem, :( although it hasnt really spread at all for the past week or so, so im guessing it doesnt really matter. Rating: 5