On Mon, 8 Mar 1999 10:33:12 -0800 (PST) Michael Dietsche
<mdietsche@yahoo.com> writes:
>
>I recently had an interesting experience baking enamel on parts. I
>put some small parts that had been primed and painted with spray
>enamel into a 200 deg oven. It looked good but the paint later came
>off in sheets. The metal was shiny -- the bond was lost between the
>primer and the part. Other baked parts were okay where I'd used
>engine primer and engine paint. It leads me to beleive some primers
>aren't suitable for the bake treatment. Back in the days when I was
>on the factory floor we baked beautiful enamel on our equipment in a
>huge oven, but I don't know what kind of enamel was used or whether we
>even primed the parts. Anyone know enough about paint to enlighten us
>on this?
>
>---Lancer7676@aol.com wrote:
>>
>> Allen--
>>
>> A while back there was a thread about baking enamel. I think wheels
>would be
>> perfect for baking. I plan to bake mine when I enamel paint them.
>Gives a
>> good hard dry finish.
>>
>> ---David
>>
>
>==
>
>Michael B. Dietsche, P.E.
Primer is not primer, Sort of like the Ogden Nash book, "Pigs is Pigs!"
A good bare metal primer is a metal etcher and a moisture sealer. Most
rattle can primers don't quite do that. It's usually one or the other.
Without the etching properties of it, there won't be any adhesive
properties to it on bare metal. Without the moisture barrier, it won't
keep the rust from creaping through it. I'm sure that we have all had
some interesting experiences with each of these cases on otherwise great
looking and careful work we have done to the pieces and wondered what we
did wrong.
Paul
PAsgeirsson@juno.com
|