Have 2 fireplaces with tile flues that had flue fires and need repair. Had 2 guys give bids to install SS liner. The guy I wanted to go with is now turning down the job over steepness of my METAL roof, the other was well over my budget. A 3rd guy came and quoted doing a heatshield ceramic coating liner. The guy that turned down installing the SS after his bid, recommended not going with a ceramic liner, stating they can crack in the future if there is future new cracking in my tiles. He said the main fireplace is likely to have future flue fires with its closed door system and very long chimney length, and a heatshield liner wouldn’t be warrentied after a flue fire. Just trying to get some insight here to help separate sales hype from reality. Thanks