Thats why I never usually mix brands , I am a PPG man through and through .
30 years and only have had 2 things go bad in 30 years of using it . Both were not my fault , one was found that a catalyst i was using was packaged with out a certain chemical in the batch , and 1980 sealer i used to use a ton of , didnt seem to have the body it normally had , and i shot it and painted over it , and it turned to cottage cheese ....LOL . Found out it was trailings from cleaning the vat they canned instead of disposing it

If you dont feel comfortable using Rustoleum , ask a jobber where you will purchase your paint , if they have a recommendation on an aerosol metal etch prime that will be compatible with your top sub-straight .