The important thing to know about spray basting is that you cannot spray it near your machine. "Near" means in the same room as your machine. The spray vapor will penetrate any openings on your sewing machine. That's the nature of vapor.
I use spray, like it, and my machine has not gummed up at all in the last 3 years. But I spray outside on a nice day with no/low wind. I did get gumming once when I used an iron on adhesive, though, so stopped using that immediately.
DH just cleaned my HQ16 after 2.5 years of use - probably about 20 quilts, most lap size, most spray basted. The interior of the machine was almost immaculate and showed no sign of gumming up from spray basting. The needle area was clean, the bobbin area had a little dust, but again, no sign of gumming in either area.