On 12/04/18 21:37, Neon John wrote:
On Sat, 7 Apr 2018 18:59:21 +0100, David Billington
wrote:

On 07/04/18 18:05, wrote:
I thought I was doing therightthing by coating my trailer with cold galvenized paint, thinking it would look lke newish hot galvenize shee finish. ? I am now faced with a dull unfinished look. what can I re coat with to get something better.
the cold galvanize paint (at least CRC brand) is an excellent primer
so you can spray just about anything over it.

Another option if you live anywhere near TN is to have the whole
trailer re-dipped. There's a company near South Pittsburgh that
maintains a zinc pond about 100 ft long and about 75 ft wide.

About 30 years ago I built an especially fine trailer and hauled it
over to be dipped. Cost was modest. Still looks like the day it was
dipped. This place is still there because I've sent people over that
way in recent times.

He will not dip anything with ANY rust on it. So the procedure is to
have the entire trailer frame sandblasted, as quick as possible wipe
on a coating of light lube oil (which burns off in the dip) and whisk
it over there for dipping.

John



John DeArmond
http://www.neon-john.com
http://www.tnduction.com
Tellico Plains, Occupied TN
See website for email address

I had many things galvanised and always found it an excellent process
and cheap for the protection provided, IIRC about 70 years + in normal
environment and around 25 years + in a marine environment but that can
be extended with additional surface prep such as grit blasting to get a
thicker deposit. My local place isn't bothered about rust or mill scale
as the first part is an acid dip to remove that followed by a flux dip,
salammoniac IIRC, then the zinc dip. My neighbour priced it up against
paint and the industrial plant he designed and the galvanise came out
cheaper overall compared to paint as the paint required blasting and
repainting from time to time. The main thing with galvanising is to make
sure the bits are designed for it so the can drain and vent, interesting
video of a non vented section failing in the dip tank here at 1:15
https://www.youtube.com/watch?v=C8EGUlerwVg