Butyl tape is used to put windows in. Is this what you used it for? You dont say much, so is a waste of space to ask a question like this.
Window butyl tape will ooze out and you cut it off with plastic days or weeks later, after it gets hot it oozes more.
You do not put sealant over the butyl tape. The tape is the sealant. If you need sealant you did something very wrong.
If you are talking about that gray tape, then you botched the whole question as this is not butyl rubber. Gray stuff is more of a clay. It does not require sealant on top until a year or two later - maybe.