I use Ultra switches as well. The first one I installed in my Hatteras is over twenty years old- it still works just fine. I have three or four of them. They are also made by a small manufacturer in the USA who owns the design. Which West Marine attempted to steal a few years ago, another reason I don't shop with them. So far, I have never had an Ultra switch fail. I agree about which adhesive to use- 4200 should be fine. the prep of the mating surfaces is more important than anything else. I think all my switches are screw mounted using the sleeve that Ultra supplies, if I am not mistaken. Make sure you get the right voltage switch. They are not interchangeable; he makes them in different voltage ratings. So that's where all my hair went.... I wondered. LOL