I purchased all of the essential molds and painted them with the high temp paint (500° F), following the instructions from That Guy Skimpy. Although they do come out shiny, the paint does not hold up forever. You may get 100 or so shots before the paint starts releasing from the mold. It will begin at the injection point where there's friction from pushing in the tip of your injector. It will then start at the edges of the creature where the two molds meet. Eventually it begins coming off in very fine particles, resulting in a bait more textured then the original cast surface. Read into the comments on Skimpy's video and you will see the same thing happened to him over time. How long the paint last may depend on how often and how consecutively they are injected.
It took a lot of time to mask off the molds, cut out the spray area, and apply two coats of the paint (allowing them to dry 24 hours between coats) for 13 molds. At the end of the day you have to decide what your time is worth. If I want a shiny surface moving forward I'll buy CNC molds. If you're making bait for yourself then everyone is correct, the matte finish doesn't matter. The fish don't care. If you're trying to sell them then a shiny surface will catch more sales. Just my thoughts.
