Yet another good alternative is hot melt glue. HMG forms a flexible,
weatherproof seal onto metals, plastics and many other kinds of
materials. In many years of outdoor use, in a notoriously wet climate, I
have never had a single failure with HMG.
Grey translucent HMG is a form of polypropylene, which means it is
chemically inert and also an excellent RF insulator. Anywhere you see
polyethylene (a close chemical relative) you can also use HMG. I have
used it routinely for sealing the exposed ends of coax 'tails' and for
blocking the open ends of semi-airspaced cables - once again, with no
failures at any frequency or power level.
The only precautions about using HMG are temperature-related. Cold metal
surfaces may need some pre-heating to avoid chilling the glue on
contact, which would cause a poor bond; and of course HMG will soften if
the surface becomes too warm. For very warm conditions, I'd go with
Chuck and use a solvent-based "High Strength Clear Adhesive", our local
equivalent of "Goop".
73 from Ian GM3SEK
>-----Original Message-----
>From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
>Chuck Smallhouse
>Sent: 07 November 2014 02:50
>To: towertalk@contesting.com
>Subject: [TowerTalk] RTV
>
>The best all around RTV, or when used as for gluing components, is
>GOOP. It's available everywhere, including grocery stores. It
>originally started(over 30 years ago) out as being used for repairing
>soles of "Tennis" shoes. They market it in several different
>varieties for various uses. I can't tell any difference between them
>so buy the cheapest variety. Most all dry clear.
>
>It will be good for RTV for filing the backshells of your rotator
>connectors. It's somewhat flexible and can be quite easily removed
>when you want to take something apart. The residue can be rubbed off
>with your fingers afterwards. I use it also to glue components as
>big a sealed relays, and OCXOs, for holding them down onto a chassis,
>deadbug style. It's much stronger than Super Glue. To glue
>something together or down, it's best to apply pressure until its
>cured/dried.
>
>To increase its shelf life, after opening a tube, it seems to be
>better kept in sealed container, like an empty instant coffee jar,
>even when its cap is put securely back on.
>
>Chuck, W7CS
>
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