I have ~4k miles on powder coated artillery rims, no tubes, no air loss. A sealer of some sort was used and a 'truck air stem' was used. The stem is threaded and provides a better seal. Ed raises a good concern if that is what you will be doing.

~ Cosmo
1949 Chevy Half Ton
Rocinante, like Don Quixote, he is awkward, past his prime, and engaged in a task beyond his capacities.
"...my good horse Rocinante, mine eternal and inseparable companion in all my journeys and courses." ...Don Quixote, Cervantes
"If you come to a fork in the road, take it."...Yogi Berra
"Rudeness is the weak man's imitation of strength." ...Eric Hoffer