Protecting 4130 until I can prime it?

I presented the following problem to a local authority and he suggested
a solution.
Can I get your thoughts on the adequacy of his suggestion?

I'm going to be removing old paint and primer from 4130 over a long
period of time. After a few hours, the bare metal will begin to rust,
so I'd like to protect it until I can apply a two-part epoxy,
probably a month or so later.

He suggests any of the lacquer-based spray-on paints would act as a
barrier, and would not deter two-part epoxy from adhering to the metal
when I get around to applying it.

Your thoughts please? - Mike

My tack welded Super Cub fuselage has been sitting in my garage for a
couple years. I am just now getting around to finish welding it. From
time to time I would just would tend to any areas of surface rust that
appeared with steel wool and WD-40. I guess it depends on your climate
but bare 4130 and minor surface rust isn't going to make your fuselage
turn to fine powder dust. I live in the Northwest and we are not very
humid. Is your fuselage kept outdoors? That would require extra
measures perhaps as was suggested.


mhorowit wrote:
I presented the following problem to a local authority and he suggested
a solution.
Can I get your thoughts on the adequacy of his suggestion?

I'm going to be removing old paint and primer from 4130 over a long
period of time. After a few hours, the bare metal will begin to rust,
so I'd like to protect it until I can apply a two-part epoxy,
probably a month or so later.

He suggests any of the lacquer-based spray-on paints would act as a
barrier, and would not deter two-part epoxy from adhering to the metal
when I get around to applying it.

Your thoughts please? - Mike

Bugs - I just didn't/don't want to re sand; also, I'm of the impression
there can be rust formed that I can't see, so I wanna get something on
the metal ASAP after bringing it to bare metal. And it gets humid here
in DC - Mike


Bugs66 wrote:
My tack welded Super Cub fuselage has been sitting in my garage for a
couple years. I am just now getting around to finish welding it. From
time to time I would just would tend to any areas of surface rust that
appeared with steel wool and WD-40. I guess it depends on your climate
but bare 4130 and minor surface rust isn't going to make your fuselage
turn to fine powder dust. I live in the Northwest and we are not very
humid. Is your fuselage kept outdoors? That would require extra
measures perhaps as was suggested.


mhorowit wrote:
I presented the following problem to a local authority and he suggested
a solution.
Can I get your thoughts on the adequacy of his suggestion?

I'm going to be removing old paint and primer from 4130 over a long
period of time. After a few hours, the bare metal will begin to rust,
so I'd like to protect it until I can apply a two-part epoxy,
probably a month or so later.

He suggests any of the lacquer-based spray-on paints would act as a
barrier, and would not deter two-part epoxy from adhering to the metal
when I get around to applying it.

Your thoughts please? - Mike

"mhorowit" wrote in message
ups.com...
Bugs - I just didn't/don't want to re sand; also, I'm of the impression
there can be rust formed that I can't see, so I wanna get something on
the metal ASAP after bringing it to bare metal. And it gets humid here
in DC - Mike

Then how would you remove the spray paint before you do the two part epoxy?

What about just painting in sections as you go?

--
Geoff
The Sea Hawk at Wow Way d0t Com
remove spaces and make the obvious substitutions to reply by mail
When immigration is outlawed, only outlaws will immigrate.

I have had very good luck with SEM, Self Etching Primer, just put that
in google and you'll come up with many internet sources. It ranges
around $14 to $16 per spray can, delivered. It covers great, dries
fast and prepares the surface for a finish coat, all at the same time.
You would have to check the specs to see if it is compatible with the
product you want to use for finish, my guess is that it probably is.
It also stinks like hell, so wear a mask and make it the last thing you
do before closing down the work area for the day.

Don...

On 4 Oct 2006 08:46:12 -0700, "mhorowit" wrote:

I presented the following problem to a local authority and he suggested
a solution.
Can I get your thoughts on the adequacy of his suggestion?

I'm going to be removing old paint and primer from 4130 over a long
period of time. After a few hours, the bare metal will begin to rust,
so I'd like to protect it until I can apply a two-part epoxy,
probably a month or so later.

He suggests any of the lacquer-based spray-on paints would act as a
barrier, and would not deter two-part epoxy from adhering to the metal
when I get around to applying it.

Your thoughts please? - Mike

Epoxy prime as you go. You can mix very small amounts by sucking it
out of the cans using syringes and mix in a small graduated cup.Apply
it with a disposable sponge brush. Any leftovers can be saved in your
freezer for a few days.