From: David Cole (DavidCole@tk7.net)
Date: Thu Jun 12 2003 - 08:36:24 PDT
Yes, I have heard about using vinegar also. I know that the sop for
painting galvanized gutter 30+ years ago (before plastic and alumunum stuff
was widely available) was to etch the gutters with a mild acid solution,
then rinse, dry and apply an oil base primer paint. Now I believe that the
best thing is to etc, rinse, dry and use a latex based paint. But I'd
check with paint manufacturers as these recommendations seem to keep
changing over time.
I remember something about the white mild before welding also, but I
haven't heard of that for a long time.
The bottom line is that painting galvanized is a pain in the Axx. If you
are lucky it won't peel.
FWIW, I made an exhaust for my 78 chevy van over 10 years ago, I used 2
1/4" hot dipped fence posts (I was low on cash) for the pipe. It still
looks like I made it yesterday. It just doesn't rust. I used a Mig
welder to weld up the pipes. I drive the van about once a month, so it's
not like I use the van a lot. Even the weld joints don't rust since the
Zinc acts as a sacrificial anode. The fumes are nasty though so take the
required precautions when welding as said before.
Dave
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
On Thu, 12 Jun 2003 10:53:51 -0400, Fred Martin <mung@in-touch.net> wrote:
> Always drink a container of white milk before cutting or welding on
> galvanized metal (sop/navy)...and do it outside in the wind...stay
> upwind. A comment about painting galvanized metal...I have heard that
> washing it down with vinegar first does the trick. Anyone else heard this
> or got another method? Fred Martin
>
> David Cole wrote:
>> Eric,
>>
>> Harbor Freight sells a bender that works ok for water pipe, galvanized,
>> black or heavy wall Electrical Conduit. I bought one a year or two ago
>> and it will bend up to 2". It was less than $100, in fact I think it
>> was $79 on sale. I haven't done any 2" pipe with it, but I have done
>> 1". It comes with dies for 1/2" through 2". They also sell another one
>> which I believe goes up to 2 1/2 or 3". I believe it is about $200.
>> That is for what is called schedule 40 pipe, which is normal water and
>> gas pipe you can find at Home Depot, etc. They also make heavier pipe,
>> which is known as Schedule 80 and 160. The outside diameter stays the
>> same but the wall of the pipe gets heavier with the larger number. If
>> you are looking for cheap pipe, visit a junk yard and ask for the size
>> you want and tell them you want clean pipe. (No chemical residue
>> inside) 20 cents per pound is pretty common in the midwest. Keep in
>> mind that you can't bend light wall tubing (like muffler pipe) in such a
>> bender without doing some tricks, like filling the tube with sand, etc.
>> The gear to bend light gauge tube gets expensive fast. But if you have
>> an arc welder, (stick), then you will have a tough time welding muffler
>> pipe with it anyhow unless you are really good as burn throughs are
>> really easy on muffler pipe with a stick welder.
>>
>> Watch out for welding galvanized. When you weld it the first thing that
>> happens is that the zinc burns off and the gases that result are pretty
>> nasty on your lungs. (I unfortunately know this from experience) If
>> you go with galvinized, grind off what you can first, then wear a
>> cartridge respirator while welding. They make cartridges just for
>> welding. Personally I think I would use black iron pipe, and then just
>> put some good paint on it. Also, paint doesn't stick well to galvanized
>> pipe.
>>
>> Dave
>>
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>>
>> On Wed, 11 Jun 2003 10:18:23 -0500, Eric (Home) <shadow@vci.net> wrote:
>>
>>>
>>> I am looking at the possibility of bending my own pipe to make a custom
>>> front bumper for a CJ2A and was wondering who might make a pipe bender
>>> I
>>> could buy on my TIGHT (squeaks) budget? Model, price, and supplier if
>>> possible, gracias!
>>>
>>> I have no idea what diameter of pipe I need to bend but I figure 1" or
>>> so?
>>> I don't want a HUGE hulking bumper, just something that'll protect my
>>> Sasgen-Derrick (sw?) pto winch. I have a arc welder so I figured with
>>> a
>>> bender I could fab something up.
>>>
>>> Also, when I go around looking for tubing what kinda business do I goto
>>> and
>>> what is the trade term for that tubing?
>>>
>>>
>>> Eric
>>>
>>>
>>>
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>>
>>
>>
>
>
>
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-- Dave
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