When joining PVC, apply PVC cement to___________.

Applying PVC cement to both the end of the conduit and the fittings is essential for creating a strong, permanent bond between the two surfaces. When PVC cement is applied to both parts, it ensures that the cement penetrates the surface of the materials effectively, allowing them to chemically weld together.

This process helps to create a leak-proof seal, vital for maintaining the integrity of the entire plumbing or electrical system. If cement were applied only to one part (like the conduit or the fitting alone), the connection may not achieve the desired strength or seal, potentially leading to issues such as leaks or disconnections over time.

In addition, the application of PVC primer to the fitting, while important in some cases, is not necessary to just apply cement; it is often recommended for the best results but is not part of the correct answer here. Taking these steps promotes optimal bonding, making it a best practice in PVC joining.