How do you paint angel wings?

The best way to go would be a spray paint.

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An airbrush used at the finest possible setting may be able to color the feathers while avoiding clumps and runs. A light coating of a very thin paint may also stain the feathers and eliminate the need for complete coverage (feathers will look light blue).

Rather than paint, staining may be a better option, using food coloring (or tempera) and careful drying. Bird feathers have also been successfully dyed using KoolAid as a colorant.