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Flake is mixed into clearcoat and sprayed. It is poss to spray on clear and drop dry flake on while still the clear is still wet - but it's messy, very wasteful, hard to make it look good, and flakes stand up on end so take a lot of clear to bury.
Normally spray a ground coat first - dark makes the flake more crackly/contrasty, similar colour i.e. gold base for gold flake makes it slightly less dramatic & more even.
Best buy some ready-mixed flake, though I'm not sure if celly flake is available in a spray can. @steverobinson may be your man there.You can get it in a 1k binder in cans, but putting celly clear onto that is a bit of a lottery - reactions, subsequent cracking etc.
Mine and another I did. Not celly though
My father used to use gesso for gilding in his calligraphy.There's some stuff here about the wood preparation and it also mentions gessohttp://www.studioarts.co.uk/links/hintsandtips/gildinggoldleafhintsandtips.htm
Andyjr1515 said:Intrigued what you have in mind for this....