Either take it to a local body repair shop to get them to paint it with colour and clear.
Or go Halfords or another car spares shop and get 2 or 3 rattle tins, some scotch bright pads and some fine line masking tape.
Once you scotch down the original colour that will be your base coat/primer, then just add lots of light coats of paint to achieve an even colour.
Might be worthwhile warming the intake up prior to painting to speed up the drying time.
RS Edition.
FPM375 Rocks
The rest of the “M” maps suck
.
