Acid dyes will dye nylon, but... it probably won't stay. I also build skin-on-frame kayaks (wooden frame covered in fabric and coated). Nylon is the material of choice and many people dye it brown or black. However, it also gets covered in polyurathane which prevents fading. Otherwise, it wouldn't stay put. So if you are going to coat it, it might work.
Scott
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I had superhuman powers, but my therapist took them away.