Why applying typical 'protectants' is a BAD idea.
Well, how to keep this brief.... so called 'protectants' are mainly water, glycol (antifreeze), and sand (silica). To make this combo work requires emulsification. Silica holds mid-level UV reflective values and is harmless. The emulsifiers and the glycol are the bad bits!
Glycol is used to maintain hydration to keep the surface wet. That old tire or faded trim looks great when it rains, right? That's what protectants do: provide temporary hydration of the substrate. Glycol is also a dangerous neurotoxin, so it's NOT good for interiors. As a final insult, the emulsifiers will eventually break down any surface, especially when it remains active due to the hydrating effect of the glycol.
Choose RENEW-PRO for a safe, dry seal that will actually protect!