Spraying a bumper

[cwspellowe]

If the bumpers already painted you don't even need plastic primer. As for spray direction, the base layers of colour don't matter, you should be flattening them anyway. You only need a final coat of colour to be in the same direction for the metallics to lie properly, just build up your initial colour as normal.

Once it's primed though you're usually good for most paints on top.

Oh and remember when doing each coat to do the cutting in and details first before the large flat areas.