[rnln]

thanks for responding. I didn't know my writing is that bad. No wonder I have no response on this question anywhere. Let me try to make it better.

22' boat. It turn out to be around 30' total.

I am trying to sew a boat cover myself, one that last. Why not tarp? I have been using tarps, 10 and 11 mil, but it doesn't last longer than couple months, especially summer. So I bought some WeatherMax80 and try to sew it myself to fit my boat. I do have access to a commercial sewing machine and can use it.

The question is thread type/size, and needle size.

Many people recommended Sailrite. Sailrite is selling their PTFE Lifetime, sounds good to me but very expensive. Therefore, I don't want to buy too much more than I need. They have 800 yards and 1,600 yard. Does anyone know the ball part of how much thread I need? 300 yards maybe?

Thanks.