[R-390] Epoxy paint toughness

[Barry Hauser]

Hi Dave:

Not familiar with that paint, but I wouldn't put anything in contact with a
recently painted surface for a long long time.  Paint may dry quickly,
especially aided by baking, however that baking time sounds short and paints
vary in terms of how they respond to baking.  For example, some paints are
primarily cure by evaporation, however in other formulations (and probably
epoxy) the curing is an "inside job" -- chemical process.  Most Krylon
paints are fast dry and fairly fast curing, but I don't know about the epoxy
version.  Rust-Oleum is very slow drying and slow curing -- actually several
months to full hardness.

Powder coating is apparently a whole 'nother story, whereby it's solid and
stable right after the process is completed.

Some wrappers are worse than others -- abrasive, acid content, inks -- but
no wrapper is best.  One clue -- if the painted item still has the faintest
aroma (nose right on it), it ain't done yet. Sounds like you should have
baked it for a much longer time -- several hrs. at a fairly low temp --
maybe 120-150 F - if the epoxy paint responds to baking at all.  Other
opinions?

Barry


----- Original Message -----
From: "David P. Goncalves" <dpg@coe.neu.edu>
To: <r-390@mailman.qth.net>
Sent: Thursday, May 29, 2003 6:01 AM
Subject: [R-390] Epoxy paint toughness


>
> I've repainted my meter cases with black appliance paint from
> Krylon; did it really nice a with zinc chromate primer, and an
> hour long bake in my toaster oven.
>
> I packed these wrapped in tissue paper to carry to work; when I
> unwrapped them, there were wear marks on the finish! How could this
> be? The meters were packed into tube boxes, and the ride wasn't bumpy.
> Isn't this paint supposed to be tough?
>
> Anybody have experience with this paint?
>
>
> Dave Goncalves.
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