I once got caught with fake paint. I was trying to get a job out and ran out of black paint so headed out to the car to get some from the wholesalers to be greeted by two men in a van in the yard, they claimed to painting contractors who had just finished a job on the adjacent RAF base, and they just happened to have a few 5 liter tins of black paint and some grey primer, as I was in a rush to get the job done I foolishly purchased two tins of each. The cans were labeled DuPont and a number nothing else and looking inside the tins and sniffing every thing appeared fine, the grey primer was good dried in twenty minuets but when I came to use the black it did not dry as fast it was not dry the next day so I had to wash all the paint off and get some more of what I normally used, as a trial I painted a sheet of steel with the black, it was not dry after a week it never dried it always remained slimy it was the paint used on drain pipes etc to prevent climbing.