You can make the tube of REMA glue last much longer if you squeeze the air out before capping. Waste a drop or 2 of glue doing this. It still beats leaving a semi to solid "plug of glue" in the opening and wasting a lot more.
I keep my opened tube + a spare tube of glue just in case. When patching at home, I use the opened tube and haven't had a problem yet over several years.