DO NOT use vaseline on plastic insulation. Petroleum is a great way to degrade plastics DO NOT use silicone rubber anywhere around copper - it produces acetic acid fumes which corrodes copper even if they are not touching. Lots of people make this mistake. If you have to seal up electronics, use parafffin wax. It is inert, easily poured into a potting block, hates water, and easily removed by moderate heat. If you want them to be impervious and un-fixable, pot them in epoxy. But don't do that with your prototype, even if it is working, because it won't be working next week. -- Lawrence Lile Jinx Sent by: pic microcontroller discussion list 12/19/2003 03:09 PM Please respond to pic microcontroller discussion list To: PICLIST@MITVMA.MIT.EDU cc: Subject: Re: [EE ] Watertight Enclosure > One other poster in this thread mentioned using Vaseline in place > of (or as well as) silicone grease. My only concern with this is I've > seen Vaseline degrade some insulation on wires Good point. Vaseline is a hydrocarbon product which some wires, rubbers and components might'nt like, whereas silicone grease is chemically inert. I did mention in my OP that Vaseline could be used "in a pinch" -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body