I don't know if they still make them, but I use a burnisher (astonishing, I know). We used to use them in the graphic arts industry for press type and I find them very helpful for restoration these days. Check with an art/drafting supply place. The back of a baby or espresso spoon works too. Suggestion: if this is your first time, you may want to practice. If you have any extraneous decal, try it say underneath the bb. It comes of with some 3M solvent pretty easily (also available form your art/drafting supply)