On Sat, 19 Jan 2019 19:46:02 -0700, rbowman
wrote:

On 01/19/2019 02:59 PM, Tekkie® wrote:
Valve stems are brass while metal caps are aluminum (IIRC) therefore
corrosion takes place. Use a plastic cap or anti-seize. IDK if silicone
grease will work.

I'm too lazy to go wandering around in the dark with a magnet but I
believe these are steel:

https://shop.slime.com/collections/t...over-valve-cap

I have gotten similar plastic caps on prefilled Slime tubes so they must
be available someplace. I've got to say that for all the vehicular
annoyances I've encountered in the past 60 years or so, having a valve
stem cap seized to the valve stem hasn't been one of them. Maybe it has
something to do with checking the tire pressure more than every other year.


MOST of those are brass or copper, often plated with tin or nickel.
All that I have used in the last 20 or more years are brass.
Some may also be aluminum
I have seen a few in steel - some in stainless - but most of them were
over 25 years ago.
It's been a LONG time since I've seen a rusted one.
Most of the non-tool type today are plastic or aluminum, but some of
them ARE plated steel (Slime's dome caps are advertized as steel)