Good Silicone / Not so good Silicone:
Water based dressings, usually a milky-white liquid, (Polydimethylsiloxane (PDS) that doesn’t contain petroleum distillate; silicone oils, waxes, or solvents that can harm rubber and/or vinyl over time. Water-based dressings use a combination of natural oils and polymers to offer a non-greasy, satin finish. Some of these products also contain ultra violet radiation (UVR) blocking agents to help keep tires from cracking, fading and hardening. Most, if not all water-based dressings are biodegradable (i.e. Zaino Z-16 Perfect Tire Gloss™) whereas silicone is not.
Silicone-based dressings, usually a clear greasy liquid, (Dimethal (DMS) that contain petroleum solvents as a cleaning agent, they remove the elasticity from vinyl, rubber and paint; causing them to evaporate out of the substrate, leaving behind a dry inflexible surface. The difference between water and solvent based is in the carrier system used. Solvent based products use a hydrocarbon silicone to suspend the product. When you apply it, the solvent evaporates leaving the dressing's active ingredients (Silicone oil) behind; this type of silicone is also not biodegradable. Most high gloss products are based upon DMS silicone oil.