Looks good, but i believe a lot of primers don't seal the metal underneath

therefore, i believe your metal is not protected from moisture!

too much time in just primer and additionally exposing it to weather may lead to all over surface rust

you see it in a lot of cars that have been sand/media blasted and then primed (usually for sale as projects on gumtree or ebay), then the project/paint was never completed. they end up with an all over surface rust as the enitre metal is not protected