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Ey up.
CNC blade or laser plotter cut graphics will always give you a sharper, more consistent and quite importantly repeatable edge so you can fix your mistake!
DM me if you want me to put together some stencils or masks for you.Flip paint off a sponge is a guaranteed fail - don't do it.
You need to lay a clean black base first and then for the chromatic product to do it's job properly it needs to lay down with some level of consistency in the coverage and a sponge won't give you that.A rattle can clear is fine for a DIY finish.
Buy a few cans of the same brand that provide the basecoats you use - they will be from the same chemical family so they will bond well.
What is best material to cut a stencil from? Frisket film or vinyl, will be cutting with scalpel if that makes a difference.
Also plan is to just sponge on a gold/green flip pigment and then clear laquer on top from rattle can, any laquer will do? Or 2k for durability?
Cheers