Painting and sealing, need advice-

[DeesBalls]

Hey all, I got some cages offline a while back for a really good price, however i am painting everything black, (ocd, everything needs to match in apartment)) any ways, i am just using cheap spray paint, from walmart. and they are turning out looking great, but few questions....

1. how long do i need to wait for all the fumes and everything to be completely gone, they are outside

2. should i seal them? if so with what?
a. 1 will be for a ball python
b. the other two will be for a guinea pig and or hedgehog

3. the cage for the ball python i need ideas for doors, had a swinging up door, but its not fit really well, and it doesnt open, so i like sliding doors, or something just looking for idea

and thats it, ill post pics once i get them all around on my phone any tips would be great..

thanks all!!