Do all LDS churches have a sealer?
Do they let non-LDS faiths use it (ie: I’m Catholic)
I don’t have any LDS friends so can I just call and ask to use their facilities?
It looks like it varies between cities. I had to work hard to get sponsor and an invite and then it was a one time thing. Some don’t let any non-Mormon’s come at all and others seem open as long as you are willing to work. All you can do is try.