Alumiprep you apply (I like to use a spray bottle and wear a mask) and wait for it to etch the aluminium. You can actually see it go dull. Then you rinse it good with water.
With the Alodine if the parts are small you can submerge them, or otherwise you brush it on and keep wetting the surface for about 10 minutes. The aluminium will turn a slight gold color. Then you rinse that real good with water and dry everything.
If you don’t touch the surface again without gloves you shouldn’t have to do a degreaser wipe, but I always still do it just to be sure.
I did my Mercury motors with this process as well.
So this morning started with etching and conversion coating the aluminium to be painted. I used Bondrite C-IC 33 Alumiprep and Alodine. That combination gives you very good corrosion protection and really good paint adhesion. Then I did an epoxy primer followed with Wimbledon White single stage. Phew!
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