Skip the wax and use a fiberglass restorer! You basically
paint these on at the begininning and end of season - and it is impervious to weather and won''t wash off. Best decision I ever made - no more buffing, etc.
I use Poliglow. Website is:
http://www.poliglowproducts.com/
A kit will cost you about $100 bucks. Was written up in Practical Sailor as being one of the top brands.
Good luck!