If you put bondo over primer, will it stay? Or does it have to be strictly stripped metal?

I'm in a bit of a spot because I was spraying primer and put some over a rust hole. The interior of the rust hole I had already treated with Rust Bullet Metal Blast (kind of a "naval jelly" treatment for metal...dilute phosporic acid, essentially). Well, I put some Rustoleum primer over the treated metal, but then I read somewhere that you can't put bondo over anything except bare metal.

So now I plan to cut the edges of the hole around, strip them to metal, but I stil have the interior of the hole, treated and primered...but will the bondo stick?