Brett 5 I prepare these for my wife’s realism gallery work. Each painting in F20 takes approximately 3 months full time to completion. Of course these have some small defects if you have a very sharp eye, however this type of board needs extensive gesso base preparation anyways so the imperfections are not visible. Once a good rabbit glue sizing is applied properly the panel will last for centuries. You only need to look at the Louvre to find such examples. People who complain about the panels are just making excuses for their own poor techniques.