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  #1  
Old 12-12-2008, 11:02 AM
qiutong qiutong is offline
 
Join Date: Dec 2008
Location: Goshen, OH
Posts: 54
Default Alumiprep/Alodine storage

Okay, I'm new here. I read alot of the previous posts and couldn't find/missed the answer to my question. I recently started building an RV-7 and would like to use Alumiprep/Alodine before priming with PPG DP epoxy primer. I would like to dip my parts in the Alumiprep/Alodine solution. My question is: After I have dipped my last part in the diluted Alumiprep or Alodine solution, can I keep the leftover solution stored for future use on the next pieces I need to prime? I've found these forums to be very helpful and I'm hoping that someone will be able to help me out. Thank you in advance.

Brad
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Brad Maxwell
RV-7 standard wing slowly being built (Wish I had more time!)
Cincinnati area (Goshen)

Last edited by qiutong : 01-04-2009 at 08:12 AM.
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  #2  
Old 12-12-2008, 11:41 AM
Mike S's Avatar
Mike S Mike S is offline
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,705
Default Welcome !!!!

Brad, first off, welcome to VAF

As to the storage of the chemicals, I got a couple of old 1 gallon plastic bottles, with good lids, and just poured the dilute solution back into them when I was done, keep the cap on tightly, store in the stereotypical cool dry dark place.

Be sure to label the bottles, and that way you wont put the etch into the Alodyne or such.

Good luck.
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VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

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Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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  #3  
Old 12-12-2008, 12:15 PM
qiutong qiutong is offline
 
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Location: Goshen, OH
Posts: 54
Default

Thanks for the quick response Mike,
When you used the stored mixtures later, did they work as well as when they were new, or did they lose some of their effectiveness. I'm hoping they can be used again and again without affecting the results. That way I can save some money, time and not have to worry about disposing of the solution after every use. Thanks again Mike.
Brad
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Brad Maxwell
RV-7 standard wing slowly being built (Wish I had more time!)
Cincinnati area (Goshen)

Last edited by qiutong : 01-04-2009 at 08:12 AM.
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  #4  
Old 12-12-2008, 12:21 PM
thallock thallock is offline
 
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Location: Austin, Tx
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Default

Brad,

Both alodine and alumniprep will lose their effectiveness after use. The more they are used the weaker they get. However, if not used and stored in a cool dark spot, they will still work after considerable lengths of time (like several years).

Tracy.
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  #5  
Old 12-12-2008, 12:35 PM
Mike S's Avatar
Mike S Mike S is offline
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Location: Dayton Airpark, NV A34
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Default

Quote:
Originally Posted by qiutong View Post
Thanks for the quick response Mike,
When you used the stored mixtures later, did they work as well as when they were new, or did they lose some of their effectiveness. I'm hoping they can be used again and again without affecting the results. That way I can save some money, time and not have to worry about disposing of the solution after every use. Thanks again Mike.
Brad
Quote:
Originally Posted by thallock View Post
Brad,

Both alodine and alumniprep will lose their effectiveness after use. The more they are used the weaker they get. However, if not used and stored in a cool dark spot, they will still work after considerable lengths of time (like several years).

Tracy.
My experience is the same as Tracy's.

The strength does go down, but the solution is still usable for quite a while.
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Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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  #6  
Old 12-12-2008, 12:58 PM
qiutong qiutong is offline
 
Join Date: Dec 2008
Location: Goshen, OH
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Default

Thanks guys,

So I guess I should be able to do my empennage pieces and then store the solutions for...let's say, a year...then do the wing pieces, only I'll let them soak a little longer since the solutions will be weaker having been used previously, right? That's what I was hoping to hear.

Did you guys get your chemicals locally, powdered or liquid? I haven't bought any yet, but I was thinking of ordering through Aircraft Spruce. I'm not even sure where to start looking locally. I'm sure I'll learn all of these things as time goes by and I start to get into "the groove" of building.

I'm also sure that I'll be using this forum to get many more answers as my project moves along. Thanks again for the help.

Brad
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RV-7 standard wing slowly being built (Wish I had more time!)
Cincinnati area (Goshen)

Last edited by qiutong : 01-04-2009 at 08:14 AM.
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  #7  
Old 12-12-2008, 01:34 PM
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rleffler rleffler is offline
 
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Location: Delaware, OH (KDLZ)
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Default

Quote:
Originally Posted by qiutong View Post
Did you guys get your chemicals locally, powdered or liquid? I haven't bought any yet, but I was thinking of ordering through Aircraft Spruce. I'm not even sure where to start looking locally. I'm sure I'll learn all of these things as time goes by and I start to get into "the groove" of building.

Don't buy from ACS unless your independently weathly. Get it in powder form. It's cheaper to buy and will cost less to ship. Plus you don't have to mix it up all at once, so shelf life is extended.

I got Dorado Kote 1 from Eldorado Chemical. A spec sheet can be found at http://www.eldoradochem.com/pb/Dorado-Kote-1-PB.pdf.
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  #8  
Old 12-12-2008, 03:28 PM
FredMagare FredMagare is offline
 
Join Date: Mar 2006
Location: Kyle, TX
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Default

Quote:
Originally Posted by thallock View Post
Brad,

Both alodine and alumniprep will lose their effectiveness after use. The more they are used the weaker they get. However, if not used and stored in a cool dark spot, they will still work after considerable lengths of time (like several years).

Tracy.
I respectfully disagree. I have alumiprep (only - no alodine) stored in a five gallon bucket (originally diluted with 2 gals alumiprep/3 gals distilled water). Nearly three years stored and still working great! However, I did have the original five gallon bucket crack. The alumiprep spill seriously etched my garage floor to a depth of about 3/4 of an inch! If you store in this manner, I suggest you keep the bucket on a tray which will contain any spill.
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  #9  
Old 12-12-2008, 03:39 PM
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Mike S Mike S is offline
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Brad, I found both chemicals at a local automotive paint supply store.

They kept the etch in stock in gallons, and the alodyne in stock in quarts, but were able to order it in gallon jugs.

Fred makes a good point about storage, this stuff is pretty aggressive.
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Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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  #10  
Old 12-12-2008, 04:06 PM
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airguy airguy is offline
 
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Default

The Alumiprep is primarily phosphoric acid, and it will do quite a number on concrete or metal if spilled. It will also react vigorously with the binding glue contained in plywood, particle board, or MDF. A couple drops on my MDF workbench caused the wood to pillow up about 1/2".

Alodyne is photoreactive, meaning that UV light will cause it to decompose. I keep my Alodyne jug inside a cardboard box, taped shut, to keep UV from my overhead flourescent lights and sunlight from getting to it. It's chromic acid and will also be corrosive if spilled, but not to the same degree as the alumiprep.
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Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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