Personally, I would avoid the Duramax like the plague. I tried it a few years ago on a tele and had a horrible interaction between the base coat and top coat (clear). It crinkled like buggery despite Dulux telling me they are absolutely compatible when I complained.
I also used it on an MDF desk top for my wife's home office set up (Hot Lips - she picked it) and it took forever to lose its tack and gas off, and it still rubs off on her elbows after 3-4 years.
Also, given that you had issues with it on your first round, should be reason enough not to go there again IMO.
The Duramax paints are enamel and I have had enough bad experiences using enamel on guitars, that I'll never use it again.
My advice would be an automotive acrylic lacquer, of which there a plenty available in rattle cans and in a broad range of colours. I'm sure you could find a nice bright red if that's what you're heart is set on.
Just my 2¢...
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