It funny stuff to squeeze out. The holes in back wall under my sink were difficult to reach, but this did the trick. I did have to use a knife to scrape off the last bits from the packet. This was fine for the small gaps around three of my pipes.
For large gaps, put a piece of wood (or something) to cover most of gap. Then, use this stuff to seal around the pipe and around the outer edge of the gap on the wall.