You can spray some poly over the decal to bury it.
I use the exterior marine grade aerosol cabots from the Big Green Shed. They do satin and gloss in the aerosol. I spray 3 coats ten minutes apart...wait two days...wet sand 600 grit...3 more coats....wet sand 800...repeat to 1500 grit if you need.
This is the gloss....
https://www.bunnings.com.au/cabot-s-...-pack_p1520270