Majic Tractor, Truck & Implement Oil Base Primer, Red Oxide Primer, 1 gal.

Majic T&I Red Oxide Primer is "oil based" - not lacquer based.

From a compositional perspective, there would be nothing harmful about mixing Majic Catalyst Hardener with 8-2989 Red Oxide Primer, but you'd also experience very little advantage by doing so

Yes. It will work with Rustoleum oil base paint.

When applied according to package directions, product will be able to be sanded after 24 hours.The primer should be allowed to dry between 48-72 hours before applying Bondo.

Our best recommendation is to remove as much rust as possible through sanding, wire-brushing, grinding, blasting etc. – if rust cannot be removed by such mechanical means, then the second best option may be to convert the active rust to a more stable surface - commercial rust converters turn rust, or iron oxide, to a more paintable surface such as iron tannate, or iron phosphate, which can then be primed, and painted, as clean steel. Majic Tractor & Implement Primers are high solids, heavily pigmented, and contain as much corrosion resistance components as is legal – but necessary to apply directly to rust – and to control the spread of rust - the product must be thin enough to penetrate deeply through-out the pits & contours created by rust, then fully encapsulate active rust as a barrier to reaction with oxygen.