Alodine

Hi,

Do you happen to remember the source of the article? This has never been
part of a protocol that I have worked under when painting aluminum after
using Alodine 1201. However, it has been so long since I have actually
"read the instructions" I dug out the paperwork for both Alodine and the
numerous primers I have used over the Alodine. The only time sensitive
reference I could find was related to the time between the aluminum
cleaning/etch and the application of the Alodine. None of the non-etching
primer product application sheets had a time reference to the delay since
Alodining - Except for the statement, "The primer should be applied as soon
as possible after the application of a conversion coatings such as Alodine.
" But, this was in the same paragraph that talked about the necessity for an
absolutely clean and properly prepared surface. Personally, I have never
had a problem with primer adhesion due to a time delay.

In the article you read, it could be that there was a concern for surface
contamination or coating damage after the application of the Alodine.
Alodine produces a very thin conversion coating and any agressive efforts to
clean a previously Alodined part will remove some or all of the coating. If
we need to re-clean an Alodined part (someone touched the surface or edges
with bare fingers after the final water rinse has dried) we use only MEK on
a very soft cotton cloth.

Maybe I have been lucky.

J








"Pat Yearick" wrote in message
om...
I read an article that said that you should paint a part before four
hours (max) of applying Alodine.

What do you do if you don't get it done in that time? Wash it off,
sand it off, paint anyways?

Thanks