Yeah what dirt said. I catalyze real low here too. I try to wait for days where it should get hot in afternoon to help. I use mainly poly though. .75-1.25% depending on temps.
As to vertical surfaces. I paint some in with chip brush, wet out my stuff and get to it with a spreader, then roller. Walmart started selling bondo jelly resin. I’ve never used it but that would be a ton easier… and yes voids are lousy. I had some. Drilled holes and injected filler with a caulk gun. They sell tubes at west marine you can load and squeeze in there
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