I bought a lamp at a garage sale - great price, bad color. The lamp
is ceramic, glossy finish. I would like to paint it another color
using spray paint.

I have a nearly new can of Kiltz spray sealer, oil based, for use on
drywall, wood, metal and other shiny finishes. It is for covering
stains and stuff. Will that work as a base coat for what I want? I
could spray it on and after it dries, spray with semi-gloss finish
paint.

If that will not work - what should I look for. Thanks.