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

Because these are oil/alkyd products, it is always good practice to sand between coats with a very fine grit paper (recommended 350 grit), or fine Scotch Brite pad. Light sanding not only removes surface irregularities (such as dust that may have settled on the surface during drying), but also aids in inter-coat adhesion, and helps to maintain a uniform & consistent finish application.

Yes. It will work with Rustoleum oil base paint.

To apply Majic T&I Red Oxide Primer by brush, first mix the contents of the gallon, thoroughly, until the product is a smooth and uniform consistency. Then, for best results, I would recommend thinning Majic T&I Red Oxide Primer with Majic Reducer, #8-0750, at a ratio of approximately 10%, apply in thin coats and allow 24 hours to dry before applying additional coats of primer, or top-coating with a finish enamel. The purpose for reduction is to help manage/control the recommended application thickness, and to aid in the “flow & leveling” of the applied film (too heavy an application, and/or re-coating too soon may result in a film that won’t dry “hard” for several days or longer).

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.