Pre epoxy metal prep

General Discussion. Make yourself at home...read, ask and answer!



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PostPosted: Fri Feb 04, 2022 8:40 pm
Thanks doright! I've been shooting mainly aviation stuff lately... lots of polyfiber. I see from your signature your quite familiar.
Like I mentioned earlier, I haven't done any bare steel since before epoxy primer was the standard for autobody. And now.... I have what seems like acres of bare steel to treat on this 70's muscle car , as opposed to the od cowel or nose bowl I'd be doing in alodine. Here is the latest piece that went home last week.
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PostPosted: Sat Feb 05, 2022 11:00 am
Nice job on the Cowl, Alodine doesn't look burned at all, nice job.
Is that a PA12? Just don't know my Small aircraft like I should, I am into Heavy's.

Cars are my hobby and escape, If I could get away with using my Dirt road and a field by my house for a field I would get a Project plane in a heart beat and dump all my car projects, but the State & the feds frown on using roads for Runways and taxi ways lol.
I am SOL till I get a bigger piece of property.

Thats a nice AMC Javalin you started 1970?
I had a 69-70 SST in the 80s wish I still had it
Dennis B.
A&P Mechanic, FCC General radio Telephone Operator
Line Maintenance A&P Mechanic and MOC Tech specialist.



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PostPosted: Sat Feb 05, 2022 9:29 pm
Don't know that I've had a burned alodine part yet I generally don't leave it exposed for more than 3 minutes. Recently I've taken to using prep towels on top of the alodine application to avoid having it dry out, it's been working well.

The javelin is a 71, my grand dad bought it new. We share the same name so my name is on the original paper work, he gave it to me when I was 17, miss him a lot, dad too. I work with my hands every day like they did it keeps me close.

If you have access to a field 6-700 feet you should build or buy a zenith 701hd cheap fun you'd have no issues building or flying out of a field that size. :happy:

I'm also juggling these two projects with my brother.. Looking forward to flying them.
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PostPosted: Sat Feb 05, 2022 9:32 pm
This is a 220hp zenith 801
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PostPosted: Sun Feb 06, 2022 11:02 am
I bet with a 10 mi hr breeze that thing would be airborne in 40 feet lol probably less! then land almost as short lol Back home in Alaska those would be fun.

That first one, that's F cool with the PT6! that thing is a Beast! wish I had one.

What I want and need is a PA32R-300 or similar? for my commute to work.
It would save me a lot of time every week, Instead of a 4 hr drive each way It would be an Hr maybe an 1.5 Hr with the preflight.


When I treat parts in Alodine and AlumaPrep, I always try to use Tanks.
Mix them up in Tanks and Just put a Lid over them the stuff doesn't go bad.
Using Tanks allows a more even and controllable Dwell times.
Its a lot easier to use that way than trying to use spray bottles, Plus No waist!
Dennis B.
A&P Mechanic, FCC General radio Telephone Operator
Line Maintenance A&P Mechanic and MOC Tech specialist.



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PostPosted: Mon Mar 07, 2022 8:47 pm
chevman wrote:Phosphoric Acid dissolves metal at a slow rate, but sharp edges such as those from 80 grit DA scratch will dissolve quickly. So I do the DA scratch after any acid treatments.


I was just reading through this again and noticed you sand again after treatment...
Have any of the rest of you sanded 80 after the metal conditioner and neutralizing steps?



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PostPosted: Tue Mar 08, 2022 12:15 am
Acid treatment and Cold Galvanizing treatment are two different things!
After cold Galvanizing You do not Sand the surface that would remove the Micro thin surface protection.
Dennis B.
A&P Mechanic, FCC General radio Telephone Operator
Line Maintenance A&P Mechanic and MOC Tech specialist.



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PostPosted: Sat Mar 19, 2022 6:17 pm
I just finished metal prepping with one choice... A pia. I've read all the horror stories, and even though I followed all of the tech data I'm still paranoid. This little voice in my head is telling me to scuff it w/80 after my mask up and before my final wipe down.
My thought is the one choice prepped any microscopic rust but scuffing will provide a bare tooth for the CRE to attach to as well.. To much analysis paralysis.. I have a few days to drill down on this. I have no white residue at this point.



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PostPosted: Sat Mar 19, 2022 6:18 pm
Conditioner
Screenshot_20220319-171635_Gallery.jpg



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PostPosted: Sat Mar 19, 2022 6:19 pm
Dried off
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