The only spray-in liner I have ever used was Line-X and I was 100% happy with it. I wouldn't do it myself becuase I'm not all that "accurate" on that type of thing and would probably have line-x on my windows.
I had an Onyx spray in liner applied because it was the only one that came with an unconditional lifetime guarantee. Yipes installed it and I could not be happier.
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