Probably a daft question: bicycle sized dust caps on car wheels?

Back on topic, Im not quite convinced tightening up a dust cap is a solution, or even a mitigation, to a slow puncture.
 
Have repumped, and loosley put the cap back on. Hoping that the cap was just too small, and allowing a tiny bit of air to be released.

Does this sound likely? I will probably find out when I get out of work to go home
I think you'll find that the cap won't be there any more when you get home
 
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