Canvases are an in-game resource in Paradise Cove. They can not be bought but can be acquired through sending ships on voyages or collecting from merchants.
Canvases are used in the crafting process.
You can gain canvases from
|Soap Maker||Cpt. John's Merchantman|
|Parchment Craftsman||Cpt. Phillip's Frigate|
|Wool Blanket Merchant|
|Glass Bead Blower|