I wouldnt reccomend spraying DBU 500 over DBC Base, use DBC 500 instead .
And FYI you can also buy a catylist for DBC makes it dry quicker and helps eliminate tiger striping and mottling of the DBC base when cleared .
It makes it like the DBU BC/CC line. But once its been catylized it will only stay sprayable for a short length of time , cant be saved like uncatylized DBC .


SprayTech