[PSUBS-MAILIST] Compass Video

[Jon Wallace via Personal_Submersibles]

 Alan, all great points and I wouldn't argue against them.  You may be right about the epoxy/pvc adhesion, and as usual the internet isn't much help.  I can find as many "don't do it" as "it works fine" opinions out there.  I should have scuffed it up a bit though, that would have helped with adhesion.  In the past I have fabricated my own "blue globe" fittings out of brass compression fittings but I wanted all plastic so I wouldn't have to worry about decay of the brass by salt-water.  I mentioned a couple of times in the video that this was a non-critical component but maybe should have impressed that a bit more on the viewer.  PVC certainly would not be my choice for a critical application.
Jon

    On Thursday, June 13, 2019, 08:22:08 AM EDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Jon,
that was one of the most comprehensive "How to" videos I've seen.
Have one of those compasses so will emulate that.
I have reservations about epoxy sealing the wires though.
I did a lot of experiments with glues & PVC wire jackets & found a lot of
the glues disappointing. I found one product specifically for PVC boats
that stood out.
I have mentioned before that I potted a couple of wires for 1" in to a WD40
filled housing & the WD40 just ran out between the epoxy & wire jacket
without pressure. 
Under pressure I would guess that the PVC jacket would be more compressible
than the  epoxy resin around it & would tear away from it, letting water in.
Suggest epoxying the whole board both sides & the wires where they are 
soldered on, in case of water egress.
I have strong reservations about the epoxy sticking to the PVC pipe also.
I would be interested in others opinions on this as potting wires is 
something we are doing a lot of.
Alan

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