Water Resistant Soft Circuit

Fused plastic bags with a conductive thread core.

For that special moment when you need a soft circuit that is water resistant.

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Plastic Bags
Cutting Implements
Conductive thread
Paper
Iron
Multimeter

Layer plastic bags on top of a piece of paper.
Lay conductive thread trace.
Layer plastic bags.
Lay conductive thread trace.
Repeat until design is complete.

I recommend that:
Two or three layers of plastic separate conductive threads that lie on top of each other.
Total of eight of more layers of plastic.

Plastic bags can be full of static so to hold things in place before you iron try a spray glue such as 505 fabric adhesive or you can sew the conductive thread thru the plastic bags.

Place the plastic bags between two layers of paper.
Using an iron on medium setting firmly press the papers together while constantly moving the iron.
Flip the paper and iron from the other side.

Once the paper has cooled peel it back from the plastic.
Volia!

A water resistant soft circuit with minimal increase in conductive thread resistance.