Maya paint weight issue

Senergy

Hi people, 

Using Maya since 2011 but just recently got into rigging.

I need to rig a simple packaging box and  I'm using the Skin Paint Weight feature on Maya but every time that I paint a joint's weight, if I go ahead and check the previous one back, it gets completely different and messed up. I'm painting each joint again and again with zero results

I tried to lock each joint that doesn't need to be painted, as well as reducing the max influences. Nothing has worked out so far

Does anybody have any suggestion on why this is happening?

Thanks a lot in advance!

Yerus

Well, this is a considerably bad rig, and bad topology too. The joints are competing for the lack of vertices in the mesh. You should try retopoing it better.

throttlekitty

Before you locked, did you first correct the weights that keep jumping back? Lets say a vertex is affected by A and B, each at 0.5. Locking B and trying to set A to 1.0 won't work because B is still locked at 0.5.

Unless it's as you say, completely different each time and acting randomly, then we have other problems, but right now I don't believe that's the case.

I'm not sure what Yerus is even hinting at, this is fine.