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https://colecoatingsworkshop.com/#/dear-susan-hooptie/
This isn't something you should do.
There are limitations with the products and the bonds.
Instead, you use a clearcoat direct to the steel and treat it as a primer and apply the fade over the top.You CAN fade with clearcoats but fading requires you to be sparing with the product and in doing so, you aren't getting the right coverage and the paint will chip off.
Would anyone have any pictures of just the front of a bike painted, i.e. stem, forks and headtube area fading into bare metal. I but there's some out there but my googling is letting me down.