I've just moved to Corvallis, Oregon and unfortunately don't yet have room to store my canoe inside. It's always been inside so if I have to store it outside I would like to do it correctly. Right now it's under a heavy canvas tarp that probably won't keep it dry through the rainy season or prevent moisture from forming between the tarp and canoe. It would obviously help to keep the tarp from direct contact with the boat, maybe with some kind of frame but that's a project I would like to avoid if I can. It's an ivory colored Royalex Vagabond. The gunnels are plastic, the seat and thwarts are wood. What I don't want is to uncover it and discover a large black stain, etc. Any thoughts? Hays in Oregon (formerly Kansas)