Originally Posted by Maine Sail
If you apply with a foam roller there should be no real need to sand or roll & tip. For the "hot coating" you want thumbprint dry. This means you can leave a thumbprint but none comes off on your thumb.
For our boat this was roughly a 15-20 minute window at about 72 degrees so one guy was rolling the last coat of 2000e while the next guy followed about 20 minutes behind. The "hot coat" layer is the most important one as it chemically bonds the first paint layer to the epoxy so you don't get peeling paint in a few seasons.
According to the Interprotect Product sheet when overcoating with VC-17m the Interprotect layers are supposed to dry for 24-36 hours, then be sanded with 180-220 grit paper.
So, it looks like the thumb prints are more for timing the Interprotect layers than tying in with my anti-fowling. This process only applies to the VC-17m or VC-17m Extra though. All other anti-fowling paints must be applied in the overcoating window.
Lotsa details to manage with these boat projects!