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.
Proper way is to wash down the metal with a phosphoric acid solution to
the metal then cover with a base primer (DuPont Variprime). Follow by a
or just top coat with a good acrylic enamel or lacquer. (basically what
do when painting a car)
If you want cheaper:
wipe down the metal to remove _all_ grease, you can do this with acetone
thinner. It would be good to etch the metal with some weak acid solution
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.
Rob V wrote:
Yes, vinegar will work but you need to be a bit more careful about the
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
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
Good 'ol vinegar followed immediately with a solvent washdown will
probably be good 'nuff
(and cheaper) for what you are trying to do.
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