[TowerTalk] sealing goop

Ian White GM3SEK gm3sek at ifwtech.co.uk
Fri Aug 1 18:04:39 EDT 2008

Jeff Stevens wrote:
>On Fri, 2008-08-01 at 11:36 -0600, Roger N0VR wrote:
>> I like the reference to the goop-lined heat shrink. I've never heard of
>> that. Anyone have a favorite source for that stuff?
>I've used several boxes of Tech Tron branded adhesive lined heat shrink
>tubing.  I buy it from  a local electronics shop but found this online:
>It's advertised as the "Dual Wall Heat Shrink Kit".  In their
>description, they leave out the 6 pieced of 3/8" tubing included.
>If you do a google search, you'll come up with lots of other sources of
>adhesive lined heat shrink.  Mouser carries it.  Heat shrink is
>expensive enough and the adhesive lined stuff is even more so.  While I
>love it, I use it only when needed.

Even through the adhesive lined tubing is expensive, it still doesn't 
contain enough adhesive for many sealing tasks.

Having tried it, I have gone back to applying my own hot-melt adhesive 
from a glue gun, followed by plain unlined heat-shrink tubing while the 
glue is still soft. That allows the right amount of adhesive to be 
applied wherever it will do the most good for sealing and reinforcement.

A couple of examples:

* Apply a thick ring of hot-melt glue where a cable enters the rear of a 
connector, and then apply plain heat-shrink. The glue fills the 'step' 
between the connector body and the cable, making a solid, strong and 
waterproof seal.

* This is by far the cheapest way to make strong and waterproof 
Y-junctions. Inject plenty of hot-melt glue into the gap between the two 
cables at the top of the "Y", and let the heat-shrink squeeze out the 
excess. Once again, you'll have a very a strong, solid and waterproof 

The final advantage of these materials is that  if you need to recover a 
connector or open up a joint, they can easily be cut and peeled away 
leaving a clean surface.


73 from Ian GM3SEK         'In Practice' columnist for RadCom (RSGB)

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