putting a shine on RV

Depends on how bad your fiberglass is. NuFinish works well of your fiberglass is in good shape and has some shine to it now. If it's really dull, I don't know how well it would work.

Poliglow http://www.poliglow.net/?gclid=CPDCzMGSv8ICFUto7AodUScA8A

There are many good products and this has been discussed here a lot. I have had very good results with Meguiars #50 Cleaner Wax for boats and RV's. I believe that if you have fiberglass exterior then use a made for fiberglass product.