Here is my model in Maya, a VW camper. Seems fine to me, but then again I am a novice who has invested the past 2 days making it.
![user added image](https://i.imgur.com/fgzvMgh.jpg)
After I try to import it into Mudbox, I'm told there is problems with my Mesh. Which I can see thanks to dotted red lines covering the model. Then I try to paint onto one side of the model and the entire model slowly starts to get covered until its the same whole colour. I have absolute no experience with mudbox, I could just be doing it wrong but I thought I would ask a modelling community in case I'm just digging a bigger hole for myself.
![user added image](https://i.imgur.com/LEMg02u.jpg)