The finisher applied too much seal coat to some of the tilt-up panels for a post office building. Most of the panels with normal amounts of seal coat look fine, but where it has been applied thickly it has yellowed. It is reputed to be an acrylic. We have tried to remove the material by sandblasting but it doesn't work. Is there anything else that will remove it?
You might inquire of manufacturers of paint removers to see if they have a material that will soften the coating so that it can be scraped or washed off. It seems likely that you would have better success with flame cleaning. An article describing the process was published in the May 1978 issue, page 275.