Right it is quite simple really,go down to your friendly local motor factors that sell AUTOMOTIVE paint to the body shops,such as Brown Brothers or Partco and ask for a plastic adhesion promoter 3M do an excellent on as does Body line,these products are available in aerosol form and are used by body shops prior to spraying bumpers and plastic panels.All you do with the stuff is simple spray on 1 coat,leave to dry,DO NOT RUB DOWN,then spray on as many coats of primer as necessary,rub down primer with 180grit wet dry following up with 400 then 600 and spray as many top coats as necessary.whilst you are at the motor factors buy some panel wipe,this is used to degrease the model,wipe on wipe off simple as that,ah ha I hear you say a gallon!!!! yes it will last for years and is handy for all forms of degreasing,also buy some TAC rags for getting rid of the dust on the model(used by professional paint sprayers prior to any application of any paint
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It is well wotrh getting all this stuff before starting to rub down your model,as it is well advised to degrease with panel wipe prior to rubbing down as the last thing you need is to rub in any grease into the plastic,rub the hull down with 600 no coarser prior to the application of the adhesion promoter etc,if you need any more info just either post it or PM me.I do know what I am talking about due to the fact that I am a professional paint sprayer.
Stavros.
Information is free,actual work is not