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Re: sealant for cockpit instrument panel
Butyl tape is almost unanimously approved by sailors for the above reasons.
It also cleans up fairly easy with mineral spirits.
There is one thing, however, that you MUST know about butyl tape:
It must be under compression to seal. You can't simply place a bead of it to seal a gap like you would "run a bead" of caulk.
For example, just a few weeks ago, I used butyl tape to reseal my cockpit engine panel. My panel fastens with only four screws--one at each corner. When I sprayed it with water to check, oh my gosh, I had a waterfall behind the panel.
It turned out that although the four screws held the panel securely, it didn't create enough compression in the middle of each side. Well, I swallowed hard and used 4200. It sealed it.
For bedding stanchions, navigation instruments, tight fitting window frames, etc.; butyl tape stuff is great!
Lastly, you can find it at Home Depot types of stores. Sometimes it's special order. It's cheap. You might have better luck at a small, local type of hardware store.
Last edited by jnorten; 07-21-2019 at 08:08 AM.
Reason: clarification--replaced "it" with "butyl tape" in one spot