Greg wrote:

I shrink mine from the middle out to squeeze out excess RTV.

That is incredibly messy isn't it? The adhesive filled heat shrink that
Steve mentioned is a far better alternative. The adhesive will bond to
most wire jackets while RTV just won't stick well enough to depend on.
The heat shrink is self contained, no messy tubes, no rags, no drips or
blobs of excess goo ...

Rick