While 3M is expensive, I strongly suggest us people hunt for genuine Sun Guard which is scratch and bubble free. Decently absorbs in UV rays and has more variety as far as shades is concerned. I had them on my Viper with no issues. This no name B.S in our market which is sometimes named Spectrum, sometime ABC etc are just third rated products. They will just tint the windows nothing more. And I would have been very happy with the tinting part in that money provided there were no issues of scratching and bubbles.
Remember: Do it once, Do it nice not twice.
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