I have the Sun Dura also on the 18' and haven't had any issues. I use a telescopic pole at each end with a vent on top. I For the jon boat and duck boat I use the silver tarps but they sit under the trees so the sun doesn't beat on it all day.
You might check with some trucking equipment supply outfits; the rubberized canvas is darn near bulletproof. They may do repairs and small custom work.I contacted a local canvas shop...... the price is not for the faint of heart. Debating on the style...whether I want snaps or straps.....and whether I want the motor cover included or separate....all an upcharge. They can't get me in until October.
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