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Step 9Seal the Plastic Sheeting to the PVC Tube
For both shelves, lift the plastic sheeting in the back where the PVC pipe is. Use some hobby cement or something, an adhesive that can bond plastic to plastic, but don't use the hot glue, it'll dry too fast. Smear some of the cement down on the inside of the tube about 1/2" down, and then smear some around the top rim of the tube, too.
Press the plastic sheeting down so it fully seals against the cement on the top rim of the tube. Then, use a knife to carefully cut slits in the plastic sheeting over the hole in the PVC, so you end up with little triangular flaps that you can push down into the tube and press against the cement.
You want to end up with an open hole from the plastic into the tube, but it needs to be watertight, or drainage water can leak under onto the wood and down the wall.
This step takes some patience and a steady hand, but luckily since it'll be in the back, it doesn't matter if it looks messy when you're done.
Press the plastic sheeting down so it fully seals against the cement on the top rim of the tube. Then, use a knife to carefully cut slits in the plastic sheeting over the hole in the PVC, so you end up with little triangular flaps that you can push down into the tube and press against the cement.
You want to end up with an open hole from the plastic into the tube, but it needs to be watertight, or drainage water can leak under onto the wood and down the wall.
This step takes some patience and a steady hand, but luckily since it'll be in the back, it doesn't matter if it looks messy when you're done.
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