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 reason I asked was to make sure my next statement or question wasnt based on incorrect data. Alclad is a top alumjiprep of pure aluminum applied to the for corrosion protection. 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.

I ask them about preping and primeing when the metal has an alkalad surface. But the normally recomended cleaner is Alumiprep Keep the part wet between alumiprep and alodine.

You’re eating up metal at that point. If you consider the alclad durable enough, then by all means leave it alone! Then you have the temper number, ie. How are you guys disposing of your spent alumaprep and alodine?


Using Alumiprep 33 before Alodine –

A few suggestions about it’s use: I was thinking alumnipep there was some more technical reason that people were prepping the alclad.

Therin lies the variable of what each builder considers the best, most durable barrier for their airplane and it’s intened useage. I guess metal prep is a real sensitive area. It will come out with a “chalky” tone too it.

It is pretty much all I am doing. Then they put a 2 part epoxy primer on. This all depends upon your definition of “durable barrier” between substrate and environment. Alumnipdep is online Users browsing this forum: They said 2 reasons. You will find that it takes longer to get that even colour you are looking for. Don’t leave the part in the alodine too long.

Nothing wrong with that as far as I know, but if you get it right, the part almost looks like it’s anodized. If the part is starting to turn dark, that’s too long. After you rinse off the alumiprep, don’t let the part dry off. Don’t leave the part in the alumiprep too long. These suggestions are purely based on my 333 years of trial and alumniprwp of error.


It would seem to me that theres no need to worry about converting the metal where the alclad is in good shape.

Listing: Alodine & Alumniprep

Only time will tell who is right. It will turn out fine. First to cover the scratches and the other is where 2 pieces of metal are put together mosture can get traped between the pieces. Any one have experience in using this cleaner, or can they recommend another cleaner and surface prep soluiont. I think it alumnirep down to your individual plans for your specific aircraft. The alodine is really needed where there is no alumnipdep protection.

Just follow the instructions for application. The alumiprep leaves the aluminum bare, and it will oxidize as soon as the air hits it. Some that are sheet metal specialist.