I would advice you to apply a clearcoat to the painted shell first and then the baremetal foil.
1 A clearcoat usually dulls the shine of Baremetal foil a tiny bit
2 A layer of clearcoat will protect the underlying paint during the application of the BF (like when you trim the foil with a blade etc etc)
3 Any irregularity on the surface that you apply the baremetal foil to will also be visible in the applied foil. So a layer of clearcoat will give you the possibility to polish the surface before applying the foil.
For small details that are not prone to greasy/acidic fingers...no need.
For larger surfaces..yes you can, a 2k or waterbased clear would be best (like Alclad's waterclear) but expect the same slight dulling as experienced with other "chrome" products.
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