Unpaintable streaks in Weight Paint Mode I am new to blender and am currently trying to rig and animate a model of a simple cartoon duck. After creating an armature and assigning it to the model however, I found the automatic weights given were inappropriate, so decided to attempt to fix them using weight painting.

Once of the changes in particular that I wanted to make was to have the flat foot of the duck be fully affected by the foot bone. My problem is this: when trying to paint the foot all red, I get these strange blue streaks appearing:



I have tried painting over them with mixture/add brushes, with and without "limit selection to visible" checked, but it does not seem to make a difference.

Am I painting the weights incorrectly? Is it something to do with the way I have set up my armature or mesh? How can I solve this problem?

For reference:


Vertex view of foot

Wireframe view of foot
Those streaks are normal. They are caused by the way the paint display works. You are acutally painting on the vertices, not the faces. as a result, you will see unwanted blue areas on some of the surrounding faces.