My brother works for a company that makes various composite parts and then finishes them with a base/clear. In their instructions for laying the base/clear it specifically states and requires to sand the base with 2000 grit before applying the clear? He asked me why they would require this. I have no idea. I have shot base/clear for years in the custom restoration world and never have done this other then to remove minor imperfections, but I would always shoot another coat or two of base before clearing. I asked what base/clear products they are using and he is getting back to me with that info. They are non-pearl or flake bases, but has anyone heard of this requirement from a paint manufacturer? Has anybody tried this or see a reason to? Thanks!