Outside of wheel doesn't mean spit, I've had much worse than that and they seal perfect. You MUST see what the inside bead looks like, the only way to find out is knock the tire off.
I do not use 'slime' or any other tire sealer, they are water based, pull tire after running it for a while and see how you've ruined the wheel. Slime will also make the wheel shake like unbalanced, BTDT. Fix the tire correctly like with a plug. I have used Walmart plugs for many years and got it worked out to now get about a 95% success rate the first time. A mod or two you need to do to get that though. Often I don't even pull the wheel.