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Every time I try to bend the face of the fender to the car body, I get these weird bumps?

enter image description here

enter image description here

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  • $\begingroup$ Try selecting the mesh and pressing ctrl + n to recalculate them. $\endgroup$ – Otto Sep 28 '16 at 14:18
  • $\begingroup$ It can be due to the vertices positions. Have a try to the smooth vertex function in edit mode (select the involved vertex/ices and smooth vertex from the edit tools). $\endgroup$ – lemon Sep 28 '16 at 15:40
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The surface is uneven, because the vertices are arranged in such a way, that the faces are bent. You can fix this by manually adjusting all the vertices to create the cleanest shape possible.

With the Subsurf Modifier enabled, you can barely spot the problem even with wireframes. The uneven vertices are hard to spot. Uneven faces

Without Subsurf, the mistakes are visible. (Note that my example is very exaggerated, but the random offset of the five vertices is still not much.) enter image description here

You can try and clean up your mesh, by going through all the vertices, and adjusting them manually from each angle. This can take more than one pass.

It will be easier if you use cleaner topology. When modeling with quads, it is advisable to make the faces as even and as square as possible.

In your mesh the faces resemble rectangles. Hence a just a slight variation of the vertices of the edge loop will make the surface seem distorted. uneven edges

Try to have all edges similiar lengths, when modeling a single bent surface. (Of course once you want sharp angles, ridges, etc. this won't apply.) even quads

You can achieve more even quads, by deleting some existing edge loops, which aren't necessary for the shape and add edge loops perpendicular to the previous.

With Subdivided Surfaces, you only need four vertices for a cirle. Keep topology rich in information, low in detail.

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