leaking manifold or exhaust paint smoke?

so, i reciently swaped my headers back to my stock exhaust for inspection. it seems there is some smokeing. If i rev it up there is more smoke.

When i first turned it on, i did see a leak in the front, adn tightened the bolts around that area and i do not see it any more. but still when i rev it up there is alot of smoke from the front and rear manifold.

I did paint these before i put them back on, so i was wondering does anyone know if the cerimic exhast paint would smoke for a period after puting it on? I know that my cermic DC headers did for a while.