Re: anti-fouling paint copper %?
Shaun, All ablative paints are multiseason. Copper content varies by manufacturer and by paint color. Higher copper content is a must for warmer waters.
Discount marine stores do not manufacturer paint. You should be able to match the West Marine and Boaters World brands to Pettit or Interlux. You may also mix colors from the same manufacturer (same kind of paint) to create a custom color.
Bottom line, choose an ablative bottom paint with the highest copper content, in your choice of color, with the cheapest price. Prime the hull if it is bare with either a highbuild epozy primer for protection against blisters, or a regular bottom paint primer. If the boat is new or unpainted, big sections of bottom paint will fall off, if you do not prime. Use masking tape to get a straight waterline.