AST is the name of the new chemistry incorporated into Scientific Anglers’ Mastery and Ultra3 floating lines. The result is a hard, slick finish that improves casting distance. It also repels dirt, algae¿¿even water, which will help guides resist icing in cold weather. The new technology won’t wear off and the lines don’t need dressing. ($49.95 to $64.95; 800-362-3456)