Will it leak?
There are a lot of different variables that can determine if a cap would leak. The answer is that both tonneau covers, and camper shells are designed to be water-resistant and not waterproof. Caps and tonneau covers are effective at preventing leaks in most cases. However, improper installation, damage, and heavy rain can affect their water resistance. Most of the time, water enters through the seams of the truck rather than through your cap or tonneau cover. Let’s break it down!
Tonneau covers-
In general, tonneau covers are effective at preventing leaks. Most modern tonneau covers are made from high-quality materials that are designed to be water-resistant. Additionally, many covers feature built-in drainage systems that help to channel water away from the bed of your truck. However, there are some factors that can affect the water resistance of your tonneau cover. For instance, if your cover is improperly installed or if the side rails of your truck sit higher than the front rail, your cover may be more susceptible to leaks. Additionally, heavy rain or snow can sometimes overwhelm even the most water-resistant tonneau covers. That being said, a few drops here and there are considered normal.
ARE CAPS-
These caps are designed to fit snugly over the bed of your truck, providing a waterproof and windproof shelter for camping and outdoor adventures. In general, ARE caps are effective at preventing leaks. However, like tonneau covers, caps can be affected by heavy rain or snow. If your cap is not installed properly or if it is damaged in any way, it may be more prone to leaks.
How to avoid leaks-
Proper maintenance, such as cleaning and conditioning gaskets, can help to prolong the life of your tonneau cover or cap and keep it water-resistant.
For areas with heavy rainfall or during extended periods of wet weather, consider using additional waterproofing measures such as applying silicone to the corners of the cap and installing a tailgate gasket.
If it's an older cap, consider resealing and replacing all the gaskets around the rails of the cap and tightening all the screws for the windows and doors of the cap.