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Leslie
From the description of your preparation, I cannot see anything there that would lead to the problems you are having. I have never painted on aluminum panels although I know it is a suitable surface. The few people whom I know that have used them, though, always glue cloth to the panels, so that is of no help. I am currently waiting to start a painting on a copper panel, myself, but that will be my first try at painting on metal of any kind. The lead white ground and campitura are curing right now. I'll certainly let you know whether I encounter the same problems you're having.
Too bad about the lack of availability of lead carbonate in Europe. The bureaucrats in most European countries are just too eager to embrace every possible regulation or guideline that is suggested to them when it comes to the "dangers" of art materials. Usually, I think of Europeans as far more enlightened than most of us here in North America, but in the case of artists' materials, there is a New Age Dark Age mentality, if you get my meaning.
Anyway, titanium white works fine.
Best of luck and sorry I can't be of any help.
Juan
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