Chapstick In Water Dump Valves

On Sunday, returning from a flight, I pulled the wing dump lever in my
LAK-17a (the tail tank was already dumping) and it didn't feel like both
valves opened. I carried some extra speed through the landing and, after
stopping, the left wing went down. A friend on the ground later confirmed
that only the right wing was dumping.

The wings were full (about 24 gallons on each side) but the LAK handled it
beautifully. My point in writing is that I'd used chapstick to
seal/lubricate the dump valves and, while sealing quite well, it also glued
the valves shut. It took both hands pushing up on the valve from under the
wing to get the stuck valve to open. Today I cleaned both valves and seats
completely of chapstick and applied a very light coating of bee's wax on the
sealing surface of the valves. They work great now (for now)...

YMMV, but I'll never again use chapstick on my dump valves.