The tradie installed the Kit Kat splashback in the laundry. Accordingly to the builder, they can’t put a trim to close off the top cleanly as it’s too thick (apparently we needed plasterboard cos wall wasn’t straight).
What options do I have? Builder mentioned he’d grout it 45 degrees upwards and then paint over it. I can’t find any pictures or information online so I can’t tell if the finish would be good. Any ideas?

