Originally Posted by bdarbyjr
... What is the best thing to use on the outside to help protect?...
hi bobby, welcome
your stream has a 2 part CLEARCOAT over the aluminum, so technically it doesn't require 'polishing'.
the clearcoat can be maintained just like auto paint/finish.
so ANY automotive wax or sealant that is safe on PAINT or clearcoat will work.
if u have a favorite product for the car/truck, try that first.
here are some threads on this topic and a zillion LINKS in the threads...
my preference is poly/sealants which last a lot longer than most waxes...