Possible Clues:

• Paint type
• Painter's medium
• Shiny paint
• Bill and Cyril spilt paint, maybe?
• A synthetic fibre
• A member of top brass touring Welsh resort taking off hard material
• Adventurous girl almost about to produce tears in material for coat?
• Paint Mr Cooper -- short and carrying blubber
• Orlon, for one
• Give a yell when they briefly pass tongue over paint