Hi Russ, Thanks for the reply. No this is 856, I sprayed some on boards just to try it out and noticed it dries very quickly also but if its soldered right away as would be the case in the machine, it's fine. I believe I tried some 857 and found the same residue issues you mentioned. This stuff looks pretty similar, has a ph of 6.6 vs 2.8 for the 857 but solid content is pretty close.
I've been fighting a white haze in some of these LPI masks that are slightly rough in appearance for a long time, this 856 seems to perform very well on some limited samples. The Kester 2331-ZX we've been using produces beautiful joints but it's really super high on solid contents and also might be reacting with some of these masks.
Bill
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