Anti-reflective coating

An important method to reduce losses due to the acrylic layer of the car is to put anti-reflective coating.

Because of the difference in refractive indexes, acrylic loses 4% of light. We can reduce it to only 2 percent by using PTFE.

The trick is to coat with a thin layer with a lower refractive index than acrylic. Even a small difference, such as superglue, Cynoacrylate, with a refractive index of 1.4 can reduce transmission loss by 1%.

PTFE is found in lubricants. It may not stick long but is more effective, at least in the short term. And easier to apply. Just spray with WD40 oil over the surfaces that needs the treatment, and then wipe out the oil because acrylic reacts with oil. 

https://en.wikipedia.org/wiki/Anti-reflective_coating

 

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