In the olden days I used to use Glyptal (a high voltage resistant
lacquer) to seal the edges of multi-layered glass covered narrow band UV
filters. The filters came in 4x4 inch standard size. I had them sawn
into 3/4 by 3/4 inch pieces and then had to seal the edges against
moisture intrusion as the filters were used in medical equipment used in
a moist environment. I never had a failure relating to the use of the
Glyptal as a moisture barrier.
I would think that Glyptal would do a good job in sealing things against
moisture intrusion provided the area treated with it did not flex so
much as to significantly stress the flexibility of the Glyptal.
Anyone out there have personal experience with Glyptal as a water tight
sealant?
Patrick NJ5G
On 4/24/2019 8:14 AM, Jon Pearl - W4ABC wrote:
Hi Keith,
I've used 2228 all by its lonesome and it's pretty impressive. Tape,
2228, then tape again might be the ticket for an even longer, long
term solution:
http://www.w4abc.com/Scotch2228.html
73,
Jon Pearl - W4ABC
On 4/2/2019 9:46 PM, Keith Dutson wrote:
I have heard the best is 3M Scotchkote. However, I recently inspected a
coax connection on the outdoor 2 meter cable running from repeater to
antenna (on top of 500 foot building). It had been slathered with
Scotchkote after sealing with two wraps of 88, one wrap of 2228
fusion tape
and two final wraps of 88. It appears the Scotchkote was useless in the
harsh outdoor environment at 500 feet. It was dry and balled up,
exposing
the 88 underneath. This connection was inspected because of high SWR
at the
duplexer bottles. The problem was discovered to be the N barrel
connecting
two runs of LDF50A. The first wrap of 88 with sticky side out made the
removal a snap.
73 Keith NM5G
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