I Sealteched my new 'foot while still under warranty. No roof leaks, but one of the clearance lights blew some bubbles. I removed the light and found the butyl tape under it had not been compressed evenly, and the bit of silicone around the edge didn't do much to help except to cover up some shoddy work. And the silicone could not be removed completely without risk of scratching the fiberglass. The windows all have the butyl squishing out under the flanges, and I don't see why the lights weren't done the same way. The light went back in with new butyl tape only. I will not be using silicone.