You keep your glue in the pot for so long out in the workshop or you refrgerate the pot between uses?
I'm not using it every day so I always mix new...
Were the glue too thick it would gel prematurely and you probably wouldn't be able to clamp it without visible glue line and rubbed joint would also...
I've seen folks sand through 1/8" thick spruce so much depends how you sand and what grits are you using. I scrape and sand plates to 150 grit before...
I only did it on european maple. Never tried it on spruce. I was a bit surprised that the H2O2 didn't bleach the surrounding wood - I applied it with...
Norway maple can be curly just like any other species. I'd cut it depending on size of log. If it is large enough I'd cut it into wedges 4-5" across...