Night shift
I had a sample of mixed epoxy filler with me at home, to keep an eye on curing process. Around 21:00 I noticed that it hardened already. Given that we have 20 degrees at home and in boatyard there is around 10 I gave it one more hour and then jump into my car and drove to the yard.
My aim was to sand the filler and coat it with primer tonight so that I can paint tomorrow. All this rush because weather forecast is threatening with winter come-back in coming days. I would really like to have the deck done so that only varnishing and anti-fouling is left before launching.
On-site it turned out that most filled spots are OK to sand but few, which got more filler, are still plastic. Sanding them resulted in epoxy-spaghetti so I left these for tomorrow.
I dropped the idea of priming them. I think it will be OK to paint topcoat on cured filler, given that I sand it to get proper grip for paint. If top coat will not cover the filler on the first paint I will roll another layer in these spots.