The International Cessna^® 170 Association

Is it possible to "Dye" seat belts to a darker colour?? (Lite Blue to Black). If so what specific type of dye should be used.

Approval aside...
Nylon will accept dye. Polyester won't.
I used to clean and dye carpets in another life. Using Rit dye or similar, you can darken but not blacken. The colors will blend. You might be able to lighten them with a very mild mixture of bleach and the dye them black. But the blue will always show thru to some degree.

The bleach will weaken the fibers. Not sure about Rit. Most dyes have agents to make the fibers accept the color at
the cost of fiber strength.

I would just buy new ones tho.

Vinegar (acetic acid) etches the fibers to encourage them to accept the dye... but as already mentioned by the bag-guy.... .... it weakens the belts. Plus...how would you prevent the hardware from rusting (unless you could remove it.)

I'd have them re-webbed...or buy replacements too.

Why not just use a "rattle" can?

SHARPIE! one with a large tip

Great advice

That's one of the advantages of getting the advice of we Aircraft Maintenance Technicians. We have some great ideas on tough problems.