Captains, I'm always about saving money. Who isn't? So I'm going to drop a little secret in on you. Sunbrella Material is a synthetic fiber fabric. It's not canvas. Canvas is cotton based. Sunbrella also generally carries around a 10 yr warranty with good care and maintenance.  Why am I saying all of this?  Well, I just finished renewing Labors Love's Tops.  They were made of Sunbrella in 1997, a…