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After spending hours cleaning tree sap off my car, I decide to buy a cover to use until I could put up a more permanent solution. Since that was 2-3 weeks off, I went for inexpensive over high quality. It's a little unwieldy to use, the FRONT and BACK tags are not centered. The two layers can be difficult to work with and are rather thin, such that snagging on a windshield wiper will tear it. It's basically a gigantic two-ply trash bag. Because it was challenging to put on or take off, I used it over the weekends and parked elsewhere when I'd be driving the next day. This may sound like a complaint. The truth is that it lasted with only a few patched holes and it kept my car free of sap. It did everything I wanted it to do, and it lasted long enough for my needs.
I would consider this for longer-term only if I wasn't using the car during that period, but for a temporary cover, the price can't be beat.