i have 3large,full cans ofbasting sprays...2 june tailor,1sullivans.the problem is that they were bought before y husband died in '91.have not even turned on my machines up until my bf "nagged me into quilting again !do i dare use them,should i test them on something just to be sure they won't ruin something ?or just pitch them ?i really want to try the 505,but hate to throw the rest away !!