Hi Johnny :
I get what is called Micro Scale Foil Adhesive and the cheapest ( read thinnest ) shiniest foil I can find . Then I take a piece the size of a bumper sticker ( their backing paper works best ) And after burnishing it face down on a piece of glass , I carefully apply the adhesive with the softest paint brush I have .The trick is keeping the adhesive thin and no brushmarks around .
Let it dry . It goes on looking like a thin version of Elmers school glue . When it is dry it is clear . Then take the foil and turn it shiny side up and lay it over the backing paper . Burnish it down till there's no wrinkles and trim the edges with a brand new X-Acto blade . Go over one more time with a soft cloth .
You can make a whole lot of it that way . Don't let the adhesive get affected by to cold or to hot temp variants . It doesn't like that ! two more points here .Look carefully at your foil .In a bright lighted area you will see a grain .Yup ! It's from the steel rollers that brought it down to it 's very thin state . Run them lengthwise on the piece .
Next ; If you want duller pieces ,Turn it shiny side up and apply the glue to that .There you should have shiny and dull foil to use . Store it inside a drawer under a heavy book or in the book . Flat and dark is what it loves . till you use it .
Use rubber and wood burnishing tools and gently burnish ( Rub ) it into place .Then finsh up on shiny stuff with some passes from a fairly new X-Acto blade alluminum Handle that has no marks or dents on it . Somehow , when you burnish seams with this especially on say Bumper ends , the seam disappears !
Remember those handles are aluminum too . I don't know why it works that is , but it works ! The biggest cost over time is the Bumper stickers .You have to have the ones that have the One Piece backing .Not the small ones with two pieces split length-wise .