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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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. I ask them about preping and primeing when the metal has an alkalad surface. Only time will tell who is right.

How are 333 guys disposing of your spent alumaprep and alodine? You cannot get the Alodine to work on without first treating with the Alumaprep A few suggestions about it’s use: 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.

This all depends upon your definition of alumhiprep barrier” between substrate and environment. So why scrape it away and scuff it up just to replace it with an alclad generated coating?


You will find that it takes longer to get that even aumniprep you are looking for. Then they put a 2 part epoxy primer on. Just follow the instructions for application.

If the part is starting to turn dark, that’s too long. The question, why scuff up or “prep” alclad before treating it with alodine.

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

It will come out with a “chalky” tone too it. These suggestions are purely based on my own years of trial and lots of error. Then you have the temper number, ie.

I think it comes down to your individual plans for your alumnilrep aircraft. The alumiprep leaves the aluminum bare, and it will oxidize as soon as the air hits it. Any one have experience in using this cleaner, or can they recommend another cleaner and surface prep soluiont. The bottle states not to use on high copper alloy aluminum. I was thinking that there was some more technical reason that people were prepping the alclad.

If you consider the alclad durable enough, then by all means leave it alone! You’re eating up metal at that point. Some that are sheet metal specialist. It is pretty much all I am doing.

Alclad is a top layer of pure aluminum applied to the for corrosion protection. If you are doing small parts in a “bath”, remember that alodine does not last forever.


Listing: Alodine & Alumniprep

But the normally recomended cleaner is Alumiprep No registered users and 1 guest. It will turn out fine. Don’t leave the part in the alumiprep too long.

The alodine alumnipeep really needed where there is no corrosion protection. They said 2 reasons. They use prep 33 and alodine all the time.

This is the stuff of primer wars. Don’t leave the part in the alodine too long. The reason I asked was to make sure my next statement or question wasnt based on incorrect data. Who is online Users browsing this forum: After you rinse off the alumiprep, don’t let the part dry off. Nothing wrong with that as aoumniprep as I know, but if you get it right, the part almost looks like it’s anodized.

First to cover the scratches and the other is where 2 pieces of metal are put together mosture can get traped between the pieces. Keep the part wet between alumiprep and alodine.