Muck This!!!!

Hey, i dont post much, but here we go! I been shingling every day ive could for the last 25 years of my life....Love it! Ive used roof Cement!Muck! Bull! You know the chit that gets everywhere! (If ya dont know how to use it)for the same amount of time .....My Pops (RIP) used it ...Eye used It! My boys use it! Do You use it? Ill cut rigglets and eat brick dust,counter flash and everything elese, But does anyone out there find times, where theres a need to rely on Muck incorporated with your flashing system,,,,to keep the leaks out? I do everytime....And im Dirty.....