[Luis-]

These shouldn't be strings, but integers;

pawn Код:

vcolor1,
vcolor2,
paintjob,

It's pretty simple;

pawn Код:

public OnVehiclePaintjob(playerid, vehicleid, paintjobid)
{
VehicleInfo[vehicleid][paintjob] = paintjobid;
return 1;
}

As for vehicles colours;

pawn Код:

public OnVehicleRespray(playerid, vehicleid, color1, color2)
{
VehicleInfo[vehicleid][vcolor1] = color1;
VehicleInfo[vehicleid][vcolor2] = color2;
return 1;
}

Just change "VehicleInfo" to your vehicles enum variable.