Can I salvage aluminized roofing paint
There are different formulations for aluminum roof coatings. I doubt that what I'm about to say is incorrect, but if you want to be 100% sure, call the manufacturer.

Diesel contains surfactants and oils; diesel will leave a residue; I very much doubt that there would be any chemcial reactions, but it will probably result in wasted or reduced quality paint. You should be able to add a little (like 10% by volume) paint thinner if you need to store it (so that it doesn't dry out) until you have a chance use it. For recycling the aluminum (and probably perlite) sludge, the best advice (IMHO) would be to mix it with more/fresh aluminum paint, and re-coat this heavy mixture over the area that you painted with light-aluminum paint.