if you have good coverage, wet sand with finishing with 1000 grit, add 1 or 2 light coats of even color, even is important with metallics, then clear.
if your are using a matching brand and type of paint, clear follow directions on the wait time.
The longer you wait the less the chance you will get a reaction. If you clear and paint the same day, go easy on the first coat of clear, the faster it drys the less chance it will raise or get a lot of dirt in it. Let the first light coat flash off then go head and apply a couple more coats allowing 20-30 between coats.
make sure the tank and side covers are warm when you paint/clear them, especially on the clear