it is a very good product but one of the many I keep on the shelf.
It has its limitation namely it is not heavy duty (i.e thick) and like any oil product, dirt will stick to it and build up over time which is a pain to clean.

I found the best way is to use a paint brush or a saturated cloth (depending on the area to be treated) and generally avoid spraying it unless the area is inaccessible
Great as a once every year or two on areas protected from the elements, specially electrical connectors as it is safe on plastic and rubber. Anywhere else, it will fade away very quickly into a dark mess.
I am currently looking at a new alternative product once my current stock is finished