It'll be fine but the copper spray may have been a very bad idea. The solvents used in most headgasket dressings distort the viton coating which comes standard on most metal head gaskets. It'll bubble and no longer adhere to the HG. If you ever need to use a dressing use a solvent free dressing such as Hylomar green or blue (labeled as Permatex Hylomar Free or Permatex Hylomar Original in some areas, IIRC).
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