Consider butyl ruber tape, the gray stuff used...

Posted By: catsailor
Date: 5/10/09 7:36p.m.

Report: outside forum guidelines

In Response To: Mechanical and Chemical (GeorgeSK - P-23 "DayDream", P-15 "Pxyis")

on RVs for windows and the like. It doesn't harden and is perfect for fittings that move. Get the gray stuff, 3/4", from an RV store. Don't use butyl caulk in a tube. A mess. Not the rubber tape Home Depot sells for electrical stuff. Don't use the black stuff. It can stain. It will get on your pants. Don't use it in the interior. 4200 works as well. Don't use it where you need bonding. It must be clamped. But I have been using it around lights and stanchions for ~ 10 years now, and it beats all comers in those applications. Clean-up is a quick trim with a knife. If it is old, mineral spirits will do well. No drying time. Does not have to be perfectly dry, which means you can use it when you are chasing down leaks. We use this stuff in the refinery, specifically around cooling towers. The durability is exceptional. There is one thing to remember; it will continue to ooze out for a few weeks, sometimes. Not much. Either leave it, or trim it with a knife. I like to trim it later the first day, and them leave the little bit that comes out later as a gasket, but it depends on the application and how wide the sealing surface is. If it is wide, trim flush.