This is a propriety formulation so I can't go too much into detail, however in many cases, applying to plastic and rubber yields no negative results.
We just tell this to customers because it has happened in the past where a customer applied to rubber/plastic and it get's a white residue. This white residue can be fixed, however to avoid the headache we just tell all our customers to avoid it. To avoid these areas we suggest applying 1-2" away. If you notice some accidental application, simply wipe it off before it dries.