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WOW...looks dangerous...the red oxide your talking about is lacquer primer...correct? I'm not familiar with the viscosity of RAL 7021, but from what your saying, a 1.2 tip should work as long as you can thin out the RAL 7021 if you need to. The red oxide is thin and you may need to turn your volume in but will apply all the primer you need,,,I think that if you take the gun apart to paint it, a touch up gun will work fine...and cost less as well.
I wouldn't be concerned about fan and needle size, and spray pattern...the pieces are so small any pattern that a 1.2 tip gives you should work.
Ray
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