Thanks to all the valuable help of this forum I have made it to the stage of 600 grit wet sanding. The photo shows where I have broken thru the SPI 2k down to the SPI epoxy while 600 grit wet sanding. All of my panels have a few small spots like these. How do y’all tackle this? I do plan to use a reduced coat of epoxy just before base coat if that makes any difference.