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There must have been a manufacturing film on the plastic I used for the greenhouse because all the velcro pieces I glued to it peeled off. One before that I fixed and the remaining 3 today when it was windy. The PVC clamps I was using to hold the vent closed were chewing up the plastic so I replaced both with rare earth magnets salvaged from old hard drives. I glued magnets for the vent and stuffed a magnet behind each of the velcro pieces stapled into the wood.
Right now I'm using 2 magnets to stick to each other, but I can replace the non-fixed magnets with steel bar or small plates.
