Reviews of this product are very positive, with extreme durability and ease of application. The chemist worked for Shell and now sells his product line out of the U.K. He told me "It can provide up to 2 months protection to rubber and plastic and is extremely hydrophobic keeping them cleaner for longer." What I like about this for the engine bay is it's an actual wax and not water based. It's very hydrophobic which is what you want in an engine bay.
Here are the results using foam brushes and applicators:
Here are the results using foam brushes and applicators: