I get 3-4 years out of Sunbrella and getting ready to order some when I saw the same yellow Naugahyde used for my rudder covers on eBay for $5/yd. I figured at that price it was worth an experiment.

Years ago somebody made black Naugahyde Hobie 16 covers for trailering. They seemed to last forever and nobody mentioned a mildew problem. One person mentioned, they dried the hulls out nicely. Then again, in the direct summer sun here, they were too hot to touch.