Painting Sheetmetal???

Proper way is to wash down the metal with a phosphoric acid solution to
etch
the metal then cover with a base primer (DuPont Variprime). Follow by a
sealer
or just top coat with a good acrylic enamel or lacquer. (basically what
one would
do when painting a car)

If you want cheaper:
wipe down the metal to remove _all_ grease, you can do this with acetone
or lacquer
thinner. It would be good to etch the metal with some weak acid solution
but some
spray primers have this as part of their solvent base.
Paint with a good metal primer (the primer is the most important part,
good primer, good service life)
Topcoat with a quality (enamel) paint.

-Bruce


Rob V wrote:
>
> I reciently built a cyclone and would like to paint the sheetmetal.
> Is there anything special I need to paint it w/.
> Or anything special I need to do b4 I paint it?
> Im assuming something like normal spray paint would work fine.
>
> TIA
> Rob


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You can use vinegar to etch it also.

Bruce Rowen wrote:
> Proper way is to wash down the metal with a phosphoric acid solution to
> etch
> the metal then cover with a base primer (DuPont Variprime). Follow by a
> sealer
> or just top coat with a good acrylic enamel or lacquer. (basically what
> one would
> do when painting a car)
>
> If you want cheaper:
> wipe down the metal to remove _all_ grease, you can do this with acetone
> or lacquer
> thinner. It would be good to etch the metal with some weak acid solution
> but some
> spray primers have this as part of their solvent base.
> Paint with a good metal primer (the primer is the most important part,
> good primer, good service life)
> Topcoat with a quality (enamel) paint.
>
> -Bruce
>
>
> Rob V wrote:
>
>>I reciently built a cyclone and would like to paint the sheetmetal.
>>Is there anything special I need to paint it w/.
>>Or anything special I need to do b4 I paint it?
>>Im assuming something like normal spray paint would work fine.
>>
>>TIA
>>Rob
>
>
>
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Bob Stewart wrote:
>
> You can use vinegar to etch it also.
>

Yes, vinegar will work but you need to be a bit more careful about the
pre-paint
cleanup. Vinegar treated steel will rust in short order an you'll be
back to square
one unless you get the residue off and metal primed asap.

What the phosphoric acid does for you is it converts and surface
oxidation into some
form of hard rust (iron phosphate???) that forms a great bond between
the primer and
metal. Back when I painted lots of cars I would get the stuff from any
auto paint
store, the DuPont product name was "Metal Prep" IIRC.

Look at the deck wash and tile cleaning stuff at hardware/homecenter
stores. Some times
it'll be phosphoric acid based, color is usually pinkish or greenish.
Avoid the muratic acid
based stuff.

Good 'ol vinegar followed immediately with a solvent washdown will
probably be good 'nuff
(and cheaper) for what you are trying to do.

-Bruce


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Great - thanks for the info.

"Bruce Rowen" <[email protected]> wrote in message
news:[email protected]...
> Bob Stewart wrote:
> >
> > You can use vinegar to etch it also.
> >
>
> Yes, vinegar will work but you need to be a bit more careful about the
> pre-paint
> cleanup. Vinegar treated steel will rust in short order an you'll be
> back to square
> one unless you get the residue off and metal primed asap.
>
> What the phosphoric acid does for you is it converts and surface
> oxidation into some
> form of hard rust (iron phosphate???) that forms a great bond between
> the primer and
> metal. Back when I painted lots of cars I would get the stuff from any
> auto paint
> store, the DuPont product name was "Metal Prep" IIRC.
>
> Look at the deck wash and tile cleaning stuff at hardware/homecenter
> stores. Some times
> it'll be phosphoric acid based, color is usually pinkish or greenish.
> Avoid the muratic acid
> based stuff.
>
> Good 'ol vinegar followed immediately with a solvent washdown will
> probably be good 'nuff
> (and cheaper) for what you are trying to do.
>
> -Bruce
>
>
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> -----== Over 100,000 Newsgroups - 19 Different Servers! =-----

"Rob V" <[email protected]> wrote in message
news:[email protected]...
> I reciently built a cyclone and would like to paint the sheetmetal.
> Is there anything special I need to paint it w/.
> Or anything special I need to do b4 I paint it?
> Im assuming something like normal spray paint would work fine.
>
> TIA
> Rob

Clean off any oils. Use a metal primer, then spray paint as you'd like.

You can also get it powder coated if you want it to be fancy.
Ed

"Bay Area Dave" <[email protected]> wrote in message
news:[email protected]...
> what the others said, and zinc chromate primer is good stuff to prime
with.
>
> dave

but REALLY not good to breathe. wear the correct mask for this, and that
doesn't mean a paper mask.

> Rob V wrote:
> > I reciently built a cyclone and would like to paint the sheetmetal.
> > Is there anything special I need to paint it w/.
> > Or anything special I need to do b4 I paint it?
> > Im assuming something like normal spray paint would work fine.
> >
> > TIA
> > Rob
> >
> >
>

what the others said, and zinc chromate primer is good stuff to prime with.

dave

Rob V wrote:
> I reciently built a cyclone and would like to paint the sheetmetal.
> Is there anything special I need to paint it w/.
> Or anything special I need to do b4 I paint it?
> Im assuming something like normal spray paint would work fine.
>
> TIA
> Rob
>
>