Alumlprep 33 is an acidic metal cleaner and conditioner expressly compounded for aluminium. Prepares aluminium and its alloys for painting or welding. Detailed Product Description: Alumiprep 33® is a non-flammable phosphoric acid-based cleaner, brightener. and pre-paint conditioner for aluminum. Alumiprep. CERTIFICATE OF CONFORMANCE INCLUDED Alumiprep 33® is a non- flammable phosphoric acid-based cleaner, brightener and pre-paint conditioner for.

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So why scrape it away and scuff it up just to replace it with an alclad generated coating?

If the part is starting to turn dark, that’s too long. If you consider the alclad durable enough, then by all means leave it alone! Some that are sheet metal specialist.

You cannot get the Alodine to work on without first treating with the Alumaprep Keep the part wet between alumiprep and alodine.

Only time will tell who is right.

Using Alumiprep 33 before Alodine –

But the normally recomended cleaner is Alumiprep They said 2 reasons. It will turn out fine.


The question, why scuff up or “prep” alclad before treating it with alodine. Alclad is a top layer of pure aluminum applied to the for corrosion protection. I think it comes down to your individual plans for your specific aircraft.

You’re eating up metal at that point. How are you guys disposing of your spent alumaprep and alodine? A few a,umniprep about it’s use: The alumiprep leaves the aluminum bare, and it will oxidize as soon as the air hits it.

Just aluumniprep the instructions for application. No registered users and 1 guest. After you rinse off the alumiprep, don’t let the part dry off.

Nothing wrong with that as far as I know, but if you get it right, the part almost looks like it’s anodized. It will come out with a “chalky” tone too it. It is pretty much all I am doing.

Alumiprep Metal Cleaner & Alodine Chrome Conversion Coating – Chief Aircraft Inc.

Therin lies the variable of what each builder considers the best, most durable barrier for their airplane and it’s intened useage. They use prep 33 and alodine all the time. This all depends upon your definition of “durable barrier” between alumniprel and environment.


This is the stuff of primer wars. If you are doing small parts in a “bath”, remember that alodine does not last forever. Any one have alumjiprep in using this cleaner, or can they recommend another cleaner and surface prep soluiont.

Then alumnoprep put a 2 part epoxy primer on. I ask them about preping and primeing when the metal has an alkalad surface. I guess metal prep is a real sensitive area. First to cover the scratches and the other is where 2 pieces of metal are put together mosture can get traped between the pieces.

Listing: Alodine & Alumniprep

These suggestions are purely based on my own years of trial and lots of error. It would seem to me that theres no need to worry about converting the metal where the alclad is in good shape. I was thinking that there was some more technical reason that people were prepping alumnipdep alclad.