Plastic rap sounds extreme.Here in the Sonoran desert in the states I just spray the engine down with a lite coating of a lite penetrating oil.I use the Amsoil Metal protector it is recommended for spraying on your guns,so I figure that ought to help prevent some corrosion.If the engine is clean,it makes it shine really good after you spray it on and dirt does not attract to it to bad.The can of metal protector is not priced bad either ,around $3.50 US,which is much cheaper than the motorcycle engine sprays for the black painted engines.I even spray the frame with this stuff,cheap and works good for me.
