I think someone said it already, but I used weed mat to cover my white ceiling in one room... I happen to have two 25x20 foot sections of camo-netting that I staplegunned up over the weed mat. Different kind of weedmats out there, but some are pretty solid... that coupled with tarp or a dark visqueen (sp?).

On another note: We just took down the camo netting and weed mat this past weekend... It was up for 9 months. No lie. Anyway, good luck.

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