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Trace the umbrella outline onto a space blanket and trim it so there are sections that overlap the perimeter enough to fold over. Hold it all together with the smallest plastic paper clips. I don't think you would have much luck permanently attaching mylar to a folder. It would need to be sectioned and glued, leaving a lot of edges to come loose.

I would go with the Golite chrome model or just find a white umbrella.
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