Keep any planned bends at least three to five inches away from any joints. You may need to block the end of the pipe with tape to prevent the sand from falling out.
Keep the heat source at least two to three inches away from the pipe to prevent burning the PVC.
You may need to use some tape to block one end of the pipe and keep the sand in. Try not to bend the pipe any closer than 3–5" away from a joint.
Let the sand heat up with the oven. After the oven has hit 425 °F (281. 3 °C), leave the sand in an extra five to six minutes to get up to the right temperature. If you have a lot of sand, more than two to three cups, stir it halfway through so that the sand heats up evenly. [2] X Research source
