Paint Bucket fill on multiple layers

[Ryder5CAC]

So im working on this huge animation ive been working on for months and when its time to color ive been having a lot of trouble. There is a segment where a character is running, the thing is that the leg layer, head layer, and body layer are not closed and I can't paint bucket them, is there a way I can merge the layers but make it so the shapes dont turn into drawing objects?

[Nicktendo28]

try this tutorial. https://www.youtube.com/watch?v=DyxG1CZ7HEE