I have used kk5000 quilting spray for years and no problems with the gumming up the machine or anything. I love it, it helps those slippery places that are hard to hold. The secret is not to overdo, as in anything, just light spray. I always use it on the backing/batting of my quilting to hold it in place while I'm basing the top in place, works great and washes out, does not affect the batting.
Hope this helps.