Ubuhlalu bengilazi busetshenziswa lapho kuwela amadube, emigqeni ephuzi ephindwe kabili kanye namathuluzi abonisa ebusuku ezimpawu zomgwaqo.
Ubuhlalu bengilazi obungaphezulu bohlobo lobuhlalu bengilazi obukhanyayo nobuhlalu bengilazi obukhanyayo obuxubekile, ubuhlalu bengilazi obubonakalayo bohlobo lwangaphezulu busendleleni emaka ukwakhiwa kwengubo abukomi, inani elithile lobuhlalu bengilazi endaweni yokumaka, ngomphumela wengilazi ubuhlalu ngokwabo buphoqa, ingxenye komugqa ku-coating yokumaka, ngaleyo ndlela kuthuthukise umphumela wokubonisa wokumaka komgwaqo.Ubuhlalu bengilazi obukhanyayo obungaphakathi bufanele ukumaka emgwaqeni okubonisayo, ukusetshenziswa kwawo okuyinhloko ukusebenzisa ubuhlalu bengilazi izici eziyindilinga, ukuthuthukisa ukusebenza okubonakalayo kokumakwa komgwaqo.Yenza izimpawu zolayini zihehe kakhulu, ngaleyo ndlela uthuthukise ukuphepha kwabashayeli abashayela ebusuku.