Tarp sun cover OK for outside storage?

[Bluewater Jon]

Hi all,

Keeping the yak outside on a rack. Inside is not an option.K to simply cover it with a plastic tarp, directly on top of the yak? Other outside options? I've looked into putting a roof on top of the rack but that only deal with the sun when it's directly overhead and that would also prevent me from working in the yak as it sits on the rack.

Thanks,
Jon