AG Glass: Spray vs. Etch – What Actually Works

When it comes to anti-glare glass, there are two main ways to get that matte surface: spraying on a coating or chemically etching the glass itself. They're not the same, and the difference matters.

Spray coating is exactly what it sounds like. You apply a layer onto the glass. It's simpler and cheaper upfront, but it wears over time.

Etching, on the other hand, changes the glass surface itself. It's more durable. The texture is more uniform. And it holds up better in the long run.

Here's what we actually measure when comparing them.

Haze is about light diffusion. The simpler way to think about it? How blurry does it look? Higher haze means better anti-glare, but you trade off some clarity. Lower haze keeps things sharp, but glare comes back. It's a balancing act.

Roughness is the texture you can feel. Those tiny peaks and valleys on the surface. Too rough, and it doesn't just look coarse-it feels wrong when you swipe. The touch gets sticky. We look at three things here: how tall the peaks are, how far apart they are, and the shape of the texture.

Gloss is the shine. High gloss looks bright and premium, but it also means more reflection. Low gloss kills the glare but can look flat. Depends on what the customer cares about.

DOI-distinctness of image-is about how clear reflections appear on the surface. Low DOI means reflections turn into a blurry mess. Which is actually what you want with AG glass. You don't want to see yourself. You want to see the screen.

Now here's a real case we worked through.

First attempt: We tried etching the whole surface-no masking around the sensor holes and camera openings. Then we did a physical polish on those areas afterward. It didn't work. The finish wasn't consistent. Customer rejected it.

Second attempt: We masked off the critical areas first. Etched the rest. Then stripped the mask, did a final acid polish. This time it worked. Uniform surface, clean openings, met all their requirements.

The takeaway? Sometimes the extra steps are the ones that make it work.