"Yes, trim off the excess after tightening. It usually takes several iterations of tightening to finally get the fitting down tight. I usually tighten it once a day for three days then trim the excess."
I can see doing this under a high load item , crane or windlass base , but goop is the seal between the parts , what purpose does squeezing most it out under a hatch serve?
Agree...In general you want any fitting to be tightened to the point that you get very little movement. The butyl tape doesn't need to be thick to do its job, it just needs to fill all the voids. The tape is thicker than the interface between the parts, so that is why it ooses out.