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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The alumiprep leaves the aluminum bare, and it will oxidize as soon as the air hits it. Don’t leave the part in the alumiprep too long. I ask them about preping and primeing when the metal has an alkalad surface.

First to cover the scratches and the other is where 2 alumnoprep of metal are put together mosture can get traped between the pieces.

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

The question, why scuff up or “prep” alclad before treating it with alodine. But the normally recomended cleaner is Alumiprep Some that are sheet metal specialist. I think it comes down to your individual plans wlumniprep your specific aircraft.


They use prep 33 and alodine all the time. Alumni;rep the part wet between alumiprep and alodine. Nothing wrong with that as far as I know, but if you get it right, the part almost looks like it’s anodized. If you consider the alclad durable enough, then by all means leave it alone!

After you rinse off the alumiprep, don’t let the part dry off. I understand the religious debates, but there doesnt seem to be many “just clean it and dump it in alclad for a few minutes” believers out there.

Then they put a 2 part epoxy primer on. They said 2 reasons. Then you have the temper number, ie.

Listing: Alodine & Alumniprep

Who is online Users browsing this forum: It will come out with a “chalky” tone too it. Alclad is a slumniprep layer of pure aluminum applied to the for corrosion protection. It will turn out fine. This all depends upon your definition of “durable barrier” between substrate and environment. This is the stuff of primer wars.

Don’t leave the part in the alodine too long. If the part is starting to turn dark, that’s too long. How are you guys disposing allumniprep your spent alumaprep and alodine?

If you are doing small parts in a “bath”, remember that alodine does not last forever.


Any one have experience in using this cleaner, or can they recommend another cleaner and surface prep soluiont. I guess metal prep is a real sensitive area.

It is pretty much all I am doing. You’re eating up metal at that point. You cannot get the Alodine to work on without first treating with the Alumaprep The reason 333 asked was to make sure my next statement or question wasnt based on incorrect data. Just follow the instructions for application. The bottle states not to use on high copper alloy aluminum. So why scrape it away and alumnpirep it up just to replace it with an alclad generated coating?

Using Alumiprep 33 before Alodine –

Therin lies the variable of what each builder considers the best, most durable barrier for their airplane and it’s intened useage. Only time will tell who is right. I was thinking that there was some more technical reason that people were prepping the alclad.