1964 Valiant "Get Runnin & Drivin"

We see lots of discussion of Rustoleum as a top coat. We are all just trying to make our rides as good as we can afford or want.
We see the big shops all say, take it to bare metal, that way they see the old body filler to remove, and their is no problem spraying some uncompatable paints. I get it and they also charge for all that work and material. We know it is big $$.
Question to RRR. Are you taking the dart to bare metal? Will you use a epoxy primer over that? We know the epoxy primer stuff sticks like glue, gives a good base for filler. Any old car needs filler.
My question of Rustoleum for a top coat is, IF after a few years it has lost it shine, and RRR wants a prettier look, can the Rustoleum be simply scuffed or sanded with appropriate grade paper, and sealed ( good idea) and top coated with a acrylic urethane or bc/cc??? I ask this as I know we have several pro bodymen that reads this stuff.
I know some will say , just take this step by step, and use pro paint and primer, but I agree with RRR, sometimes the cost is not on everyone's plate.
OIL based enamel? I well remember my dad cussing when they took lead ot of paint. He swore it was not worth chit anymore!! Back in what the 60's??
I am lke RRR, I do the best I can afford. Might be 100% great, sometimes maybe different. IF I was building a car to sell, it would have to be the best that is reasonable for what it is. Building for me, I am the only one that has to be happy!