Since the instructions we've helped you with have been as detailed as we can make them given what you've told us, here's the best advice I can give now...
Go out and buy lacquer and spray it next just like you said.
If you put it over polyurethane, it might craze and bubble.
If you put it over enamel, it
will craze and bubble.
If you put it over an acrylic enamel, it will craze and bubble.
If you put it over lacquer, you stand the best chance of it working well. But we don't yet know what type of paint you used in the first place because YOU HAVEN'T TOLD US!
It's a waste of
our time to go on any further...
