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Discussion Starter · #1 ·
I just finished building my own exposure unit with a 1000 watt MH bulb. I'm having a problem though creating a tight seal around my cover. I've installed weather stripping around the rim of the box, and under the glass. I'm using pond liner sandwiched between some 1X material. I have even layed down a bead of caulking within the sandwich, but still can't get a vacuum. Any suggestions on how to create a tight seal?

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