Name: Rob
Message: Hi, I have a set of car seat harnesses which I would loosely describe as nylon in appearance, (not having any knowledge of these things)would the standard acid/heat approach to dying them work? Will the colour be fast in the sense that wearers will not pick up the dye from the belts if worn in a hot-sweaty car ride.  The belts are currently purple and I wish to dye them black.  Thanks for your help

I think it would be best for you to get new harnesses custom-made to match your car. This way you can be sure that damage has not weakened them and made them less safe, and then there is no issue concerning the fastness of the dye.

If your harnesses are made of nylon, they can be dyed by heating them in acid dye, but if they are polyester, they require extensive boiling in disperse dye. I am concerned that the boiling might not be good for their stitching. It could be dangerous if the stitching is weakened at all.

See also this page:
HOW DO I, AND WHAT DO I USE TO DYE AUTO SEAT BELTS? 
(Blog entry for March 2, 2006)

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