Polypropylene lasts about 2 weeks in the sun without any UV protection. About how long would it last with carbon black, HALS or other UV absorbers beside carbon black? How much longer would nylon last with UV protection?
Sorry 'bout that. I couldn't find it either so I called Bayer and they said look at www.BayerFantasia.com They have 4 products under that heading one of which is designed to color premolded plastics. That is "aura". Good luck
It may be possible to dye it with a disperse dye. These are available from most dye suppliers.
Make a dispersion of the dye into water, heat to near boiling and put the parts into the heated mixture. It may take a while.
Alternatively, coat the article with a thin layer of this dye and...