You could, but I would not use anything but the tape. The consistency of the tape is what you need, caulk may or may not have the right consistency, why risk it? With the tape you will be able to take it apart next time it leaks, with the wrong caulk you may tear the roof.
Place the tape tighten down the vent, give the tape a little time to spread and snug up screws. You can always warm the tape inside before applying it.
Originally Posted by campfun
can i use just regular caulk or should i spend the money on the butyl tape? Is it that much different.. Will the caulk level out in low 60 or high 50 temp. It is suppose to be nice weekend thinking of doing this over the weekend> thanks