I still throw a tarp over them to keep tree sap and bird poop off.
One poly canoe spent a summer on sawhorses, now I keep a couple canoes stored on a trailer and some kayaks on an old bunk bed frame. Mostly the tarps are not directly in touch with the boats.
In my experience the best way to store a poly canoe is loaded on a double decker trailer under is an aluminum canoe.
Remember for best results put them in the water frequently.
Wabakimi Canoe Pack
Canoe Pack Liner
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