it's called a baked on powdered epoxy finish for a reason -- you start by purchasing a powdered coating applicator/gun and a selection of powdered epoxy in the color you want.
take handles off knife, connect electrode, fill hopper on paint gun with the appropriate material and spray it on the knife -- it will electrostatically adhere to the uncoated metal.
Once the blade is coated to your satisfaction, and the new finish has dried enough to handle, hang the blade in an oven and bake according to the instructions on the powder container.
do not exceed 375 degrees or the temper of the blade may be damaged.
while the blade is baking, clean up the electrostatic paint gun so it can be reused the next time you scuff the finish on your knife.
let blade cool, put handles back on, and use knife more.
repeat as needed.