To be more specific about the article I referred to previously, it is entitled "Interior Trim Refresh" (Panorama article - November 2018) in which it describes Airbrushing 101. Since posting I have located the name of the company 'Chipex' that I previously saw advertised which includes 356 Porsche colours. There may be others and I would require a sufficient quantity. I'm happy to pay for whatever quantity to get the job done.