On Sat, 21 Nov 2009 23:11:40 +0000 (GMT), Dave Plowman (News) wrote:

I cleaned some down to bare metal, treated with Jenolite,

Is that something akin to Kurust? I've had good results with that
stopping/converting corrsion.

sprayed on zinc rich primer

Obviously not that zinc rich or not in glavanic contact with the
steel.

Drygalv does the business here. Ground off head of a bolt used as a
gate latch has not rusted. Similary shed bought washers bolts drop
latches on the trailer that is outside 24/7 and has been for a few
years. Admitedly they are also "zinc plated" but we all know how
useless that is when outside 24/7...

Drygalv has a couple of drawbacks: It is expensive (IIRC I paid about
a tenner for a small 250ml? tin) and is rather soft as a paint but it
does work.

--
Cheers
Dave.