Hi, I’ve been Plastering for about 10 years on and off worked with a lot of different plasters and felt my quality to be satisfactory Im in central London to skim a Wall 7m by 7m that has an led light that shines out the wall looks good in the day time and with the led light but they’ve checked it at night with torches and say it’s not flat Enough, not really sure what to do I don’t think re-skimming will get it any closer ive touched the wall up once at night with a flood light across it but they have not checked it again with a hi powered touch and can notice more imperfections what’s the best solution.