Bearseatfish another option for tipup line you may what to research is the line used for flying kites believe it is similar to the line used by masons while laying bricks. I agree that you should purchase braided nylon or dacron line for use on your tipups. Long time Ice Shanty sponsor Fish 307 in Lake George,NY. sells 27 and 36 pound test braided nylon in 1,000 yards bulk spools this line is waxed to help slow water absorbing and freeze up not cheap the bulk spools cost $42.00 plus tax and shipping. A 1,000 yards spools should last you several years depending on how many tipups you have and how often you change out the line on them.
Steve