Nice. I am going to have to install something again this year on our Prius. Last year it was clear acrylic and it worked well. I would use it again, but the acrylic was so thin that rocks punched holes right through it. If it didn't get thrown out, I could use it as a template for this years... I had used black electrical tape around the perimeter to prevent cracking/breakage along the edges and black zip ties to attach. it was kind of a pain to get done, but really didn't take that long. We had good heat even driving back to Alabama from Wisconsin in -6degF weather at night! Since we had nothing to compare against, I didn't know if it made a difference, so thanks for that tidbit!
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