Today we'll tackle the problem of coil stability in a new way.
Here is a new 10' section of schedule 40 4" Cantex, ready for cleaning. Scotch-Brite and windshield washer fluid are used to remove small surface nicks and dirt.
The two black plastic brackets holding the tube are called base spacers in Cantex-speak, part number
5355969, and are not very expensive. They come in very handy if you do any work with 4" material.
After cleaning, a protractor is attached to the bell end of the tube.
have two end points for the next step, snapping a chalk line.
Dynaflex 230 caulking compound, purchased from the Home Depot. Please read the instructions on the container. This stuff sticks to PVC and is useful over a wide temperature range. You may want to make a practice run first. Try putting down a bead about 1/10 of an inch in diameter.Then use a latex glove or wrap your index finger in plastic wrap and smooth out the caulk manually. The goal is to make a small adhesive pad for the coiled wire. Give the Dynaflex 5 minutes to set up before removing the tape.
The thin caulk line presents a low profile on the tube. Next, we wind the coil.