Silicone caulk is supposed to seal it. I dont really know exactly how to install it, but I would really like to know seeing how I am building a box tomorrow. Anybody that knows how please fill me in.
Just take the silicone and run a bead of it at every seam. You can use your finger to smooth it out and ensure that it has penetrated into the cracks. If you are building a box from scratch, I recommend putting a small bead on the joining edges before you screw them together. This adds strength to the joint.
Anonymous
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liquid nail is also a good for running the bead, another idea to insure its sealed air tight is to buy a can or two of spray in truck bedliner and spray that inside the box. Its not much and always makes me feel more comfortable when building the box
or you can use uber amounts of glue when building the box...thats normally what i do because its too hard to go in the port and caulk it up while in the building process
I say Glue, Clamp,pre-drill holes, then put the screws in. After that i take some silicone and line all the cracks from the inside, If its a tight squeeze just use your finger.