This is going to sound weird but I am looking for ideas on how to fully waterproof a 18650 pack. As in submerge the whole pack in salt water a few times a year and it will be fine.
Living in a tropical country I deal with heavy rain several months a year. I found that water is really good at wicking under shrink wrap and will get into everything eventually.
I have used lipo up to this point and found its very easy to waterproof them as they are basically a plastic pouch with two aluminum contacts at the end. The aluminium tabs is the only spot that can corrode.
But on 18650’s the can is steal. I have seen a few guys with water damaged packs, and the can rusts out pretty bad then cells start to leak.
My current plan would be to remove all the shrink wrap, spray the cells with a colored silicone conformal coating, masking the positive and negative ends. Then building the pack. After the pack is built the exposed joints could be conformal coated with the brush on style @b264 suggests. Then clear shrink wrap the whole pack for easy inspection like @psychotiller does. Or forgo the shrink as I have found its better to just let it get wet and then dry it off after a ride with a fan then let moisture stay trapped under a wrap?
Got any other ideas?