Which line for a mainsheet

[Brian Duff]

any single braid will be delightful running throguh the blocks easily. Oh- don't use double blocks in a mainsheet, use fiddles or singles.that will help too.

use polyester if you want that simple all white look ( or are poor ).

use swiftcord, apex, salsa, conception, racing sheet, if you can afford a dyneema/polyolifin blend and like that Christmas tree look.

a fine tune is likely not needed for your boat unless you have laminate mainsail. plain dacron is crude enough to just use the major tackle to control.

cheers!