we use it all the time at work there are several manufactures out there. I like the starbright we normally get out of the stock system. the 3m stuff is good too, but it takes several coats. we use it on control lines and coaxial lines I do have a large write-up i have included in contracts but here is how we use it to keep it simple:
1 wrap of self vulcanizing tape(the silicon wrap everything tape in every color to fix it stuff is sold at most hardware stores in small quantities) start at the middle of the cable, work to 1 inch past the opening, then back to 1 inch past the other opening and back to center. when wraping the tape there is a line that line is to mark the edge of the wrap comming over it. be mindul not to allow bubbles; and when it sticks to itself its stuck, so the only way to remove it is with a knife.
2 wraps of regular electrical tape (i prefer super 33 or super 88 from 3m and the two are for different temps) when wrapping go 1 inch past the self vulcanizing tape; and follow the middle, edge, edge and finish middle.
3 thin coats of the varnish
be careful not to allow bubbles, pockets allow air to condensate; which allows moisture. oh and the varnish may permanently stain your clothing FYI
if you have any q's let me know I will try to watch this thread closely.
we are required to do this to every topside connection on my ship monthly; and before and after every patrol. it takes a team of 6 people about 2 days when the weather co-operates. there are times like right now that we do not do this since it would be more damaging to allow the elements in...stupid alaskan winters
k so i think i may have beat this one into the grounnd. Again if you have questions let me know. I have some videos from the navy on how to use it.
Additionally there is a newer device that is out that works the same and it is called Ray-o-lon and is awesome. Much much faster.