Is Rustoleum paint okay to use as a "primer paint" before spraying the more expensive auto paint on a vehicle?

if have previously sprayed Rustoleum paint on a vehicle , but now want to spray a more expensive "automotive paint" on it....did the Rustoleum paint underneath serve any purpose at least? as a primer? (used both primer and paint in Rustoleum brand) BTW, ANYONE CAN TELL ME DIFFERENCE BETWEEN RUSTOLEUM... show more if have previously sprayed Rustoleum paint on a vehicle , but now want to spray a more expensive "automotive paint" on it....did the Rustoleum paint underneath serve any purpose at least? as a primer?

(used both primer and paint in Rustoleum brand)

BTW, ANYONE CAN TELL ME DIFFERENCE BETWEEN RUSTOLEUM PAINT AND "AUTOMOTIVE PAINT"? WHY AUTO PAINT IS MUCH MORE EXPENSIVE?
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