I don't consider myself a competent enough colourist to write a proper howto for highlighting rubber or other polished shiny surfaces, but I figured that people lower down the ladder might find it useful if I were to share what I've learned so far, and also as a way to document the progress I've made starting with Daryil's Shiny Whore Gloves and finishing up with Sheila's catsuit.

The images are from my comics 'Project Future' and 'The Epsilon Project' - the line art was done by Merlin.

Presented as a large image so you can study the details (50% scaled from the original comic artwork)