The reflow profile is set from the paste tech sheet (Kester NXG1) (45-90sec reflow time), I'm at about 60-seconds. So, this is good.
I don't know if the type is ok. It was recommended by a supplier, I use it for every board, fine pitch or not.
Paste comes out of the fridge, gets put in the printer, and the jar goes back in the fridge or in the trash if it's done. How long is too long for the paste on the printer?
The boards are used as needed, so some may sit unsealed, but I get the same results regardless of whether it's the first or the last board. How long from unsealing to use is too long?
I don't really know what I could do about RH, even if i could measure it. It's not very dry or humid where I'm doing this, but other than that, I don't know.