What are the advanteges of waxoiling the underneath of a vw camper van?

its it to prevent corrosion and how is it applied?What are the advanteges of waxoiling the underneath of a vw camper van?In simple terms, it protects against corrosion, prolongs the life of the covered surface, and is sprayed on from a pressurised container in which it comes, unless you buy in bulk, in which case it comes in a large drum and you decant it into a container you then pressurise yourself....Simples!