I like spray basting and I also use 505. It has worked great for me. My Bernina hasn't had any problems. I think the letting it dry first suggestion is a good one.
This topic reminds me of pre wash/nevr pre wash; iron with starch/never starch. Everyone tries things and either adopts it or doesn't. it is nice we all have a choice. :-D
BTW: I always wash my fabrics first and sometimes iron with starch. Mostly I like spraying/ironing with plain ole water!