Yes, if the nozzle isn't sealed the whole tube can become a nolathane bush !
I have a tube that's survived 6 months so far, 2x nozzles as they do harden inside. The end of the nozzle has a cap that screws on lightly to save it from settings as best it can.
Went in the shed this morn to check strength of the sika glue and I nearly broke the bumper in half so no need for safety fglass. The bumpers got another final sanding with fine grade and I went straight to paint, no primer , done in super gloss black as it's good to see any imperfections. They aren't perfect but with a 2000 grit to flat off any dust lumps they should be fine. Painted with that mini spray gun again, can't believe a $8 gun can be so good!

Also while doing the bumpers I have a plan to copy mold a mk1 Escort 6dial fascia, don't panic this one is a MST reject I got for $90. I painted it in the same gloss black so when I pull a mold it should be as smooth as the part. Yes the mold will be used for my car but will be changing a thing out two .

Once done this part of it survived will be up for sale
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