Very slow leak around alloy rim.Anyway to seal without removing tire.

 

It's common for them to corrode. You could try a fix a flat or slime type repair where you add goo through the valve stem. If you do this please tell any repair shop in the future. They hate the stuff.

The better option would be to remove the tire (or break the beads and push tire aside) and clean the wheel.

Now if the wheel is bent or damaged you're in a different situation.

 

Duct tape might get you by for a while.

I swear to god, who asks these kinds of questions?