That was me I guess. It's an oil spray that lasts one season. Here in
Ontario there are several brands, the main chain being Krown, but there are
many others. This fall I had my Focus done at Wal-Mart. Cheap and lots to do
to pass the time (about an hour).
The proper undercoating by Tuff Kote Dinol, or Tectyl or what have you is
quite an expensive story these days.
In the north of Sweden, as an alternative, some people spray saw chain oil
under the chassis and the internal steel parts of the doors.
Saw chain oil contain a fair amount of rust inhibitators and some adhesive
additives for the oil to stick and preserve. It also is not the worst type
of oil for the skin to handle.
Some warm the oil a little and some mix it with white spirit or diesel fuel
Over the years I've tried several underbody treatments. The normal
underseal (the black tar like stuff) was the worst. After a few years
it used to crack and let water in where is was trapped and hence
rusted the body, generally unseen until too late. I also tried water
proof grease mixed with petrol (to thin it down) and bushed that on.
The petrol evaporated leaving the grease coating behind. Although very
effective it didn't last too long. Then I tried a product called
Waxoyl. This is a wax based treatment and I can say from experience
that is by far the very best underbody treatment I've ever used. It
can be brushed or sprayed on. It is quite common here in the UK but
not sure in the US. I did a quick search and found this URL
http://www.propermg.com/waxoyl.htm so it is available.
Hope this helps.
I know that in the northern U.S. snowbelt a variety of commercial products
are sold. Not sure how many of those are offered in Virginia, but I think
anything sold by a brand-name store or auto service chain should work fine.
Galvanizing is just a special coating put on the steel to prevent the Steel
from Oxidizing (i.e., rusting) in order for Steel to rust it needs Oxygen,
take away the Oxygen source and you prevent rust.
That said...I have seen galvanized metal rust...it just takes longer.
I live in VA, where they don't SALT the roads, they just put out Sand, but I
do live by the Ocean, so salt corrosion is only a small issue.
I am just looking for a rust preventitive in lieu of undercoating.
03 ZX5 21.3k
"Those who forget history are condemned to repeat it" - George Santyana
Half right, I would say. I had a 87 Audi before the Focus, and the paint on
that one did not stick very well to the zink coating. But after 14 years
there were no parts rusted through, although it didn't look very nice then.
If I look under my Focus, I can see a lot of parts and pieces that are not
the body itself. And those brackets and screws and stuff does not seem at
all so well protected on the Ford as on the Audi. A thin black paint layer
without any primer or any anticorrosion vax as far as I can see. Some
additional protection will certainly be useful if you want those parts to
stay put, and also remain detachable if service needs to be done.
Unfortunately no, although galvanizing helps. But zinc is not very strong
and chips easily which lets rust start and then creep under the coating.
Same with those "permanent" anti-rust coatings.
oil or wax sprays under the chassis are a great idea, and not only protect all
the nongalvanized parts, cracks, etc., but actually helps sound proofing.
Just be careful to keep these sprays away from the rubber suspension, exhaust,
and motor mounts.
They can soften up the rubber.
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