Being an older woman, I never knew this stuff existed. All my life I had to find a way to fill in cracks and holes before caulking. Now I have this Filler Rope Backer Rod Roll and I am very happy. I wish I knew about this before. It is so easy to use.  I have tried the putty like rope caulk but it kept sticking to my fingers. Once I have this in place it stays there, awaiting the caulk. My foundation has serious cracks and gaps, mostly on the front and back porch. This will not solve my foundation problems but it will help with all the bugs and insects. Those little creatures are everywhere here in southeast Texas. I order 3 sizes of this filler so as to be certain I have all the crack fillers I need. Some reviews did not like the color. I could care less as long as it gets the job done. So, if you are looking to simplify your repairs, this is EXACTLY what you need. I highly recommend it.