Ukulele specks are paint with several layers od diy wipe on poli (varnish,linseed oil terps mix) I found from this site. To a mate finish.
The intended use of the pick guard will be more to give a shiny smooth finish to apply my pickup. I have a Myers Gooseneck pickup etch attaches to the body of a guitar with a suction cup.
See The Grip with Flexible Micro-Gooseneck Myers Pickups "The Grip" Series


Any ideas would help thanks