Possible Clues:

• Glossy shoe material
• Shiny shoe material
• Cheaper jacket or shoe material (2 words)
• Varnished hide
• Planet earth - ET runs off to hide when finished
• Fan of gloomy music grew hot
• Tanned animal skin made hard and glossy
• Treat the panel specially - it will present a varnished surface
• Material for some jackets (2 words)
• Hide behind obvious raw material with a bit of gloss