sorry trying to use my phone for that reply didnt work so well so here we go again
the sand prep he is talking about is a ppg automotive product i think the # is dx103 but not sure i havent used it in a long time. you can just use a little joy dish soap and a red scotch bright. the isopropyl is the same thing you get at wallmart. and no not spray adhesive. adhesion promoter. the sealer is a primer. the color of the plastic does not matter it will be covered by new paint. the color will be called base coat it will dry to a flat finish. you then put clear to make it shine. these products will all be available at an auto body and paint supply.