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I am currently checking the grammar of a friend's website and am finding it quite tricky when dealing with compound adjectives. Specifically, I would like to know when to use hyphens and when to put a comma betweeen compound words. Could you please tell me if I have got the following phrases correct?

1. It is similar to the ever-popular Ford Focus.

2. As with all dual-action machine polishers...

3. Manufacturers have started using super-hard, scratch-resistant clear coats. (comma between compound words?)

4. It features state-of-the-art technology.

5. It uses the highest-grade paint available.

6. The aim is for a high-gloss finish .

7. This is a professional-strength product...

8. It is designed for darker coloured cars. (no hyphen?)

9. This environmentally friendly product. (no hyphen?)

Thanks
Comments  
EML67

1. It is similar to the ever-popular Ford Focus. (ok)

2. As with all dual-action machine polishers... (ok)

3. Manufacturers have started using super-hard, scratch-resistant clear coats. (comma between compound words?) (ok)

4. It features state-of-the-art technology. (ok)

5. It uses the highest-grade paint available. (ok)

6. The aim is for a high-gloss finish. (ok)

7. This is a professional-strength product... (ok)

8. It is designed for darker coloured cars. (no hyphen?) (ok)

9. This environmentally friendly product. (no hyphen?) (Ok. In the past, a hyphen was required. Nowadays, a hyphen is not required.)
Thank you very much! Emotion: big smile