Hi Keith - before you export to .obj make sure to join surfaces together so that MoI knows which edges are shared.

To do this, select surfaces that are adjacent and use Edit / Join.

When the surfaces are completely separate objects, they can get meshed with slightly different vertex structures along those edges, which can result in little cracks and holes.

But when they are joined together, MoI will recognize that the edge is a shared one and will do extra work to make sure the mesh vertices along that edge are unified and crack-free.

Here's what your hood looks like when exporting with joined pieces:



Let me know if you still have any problems,

- Michael