>>7414892Model fag here to help.
>What sort of paint should I use to repaint this scooter into the color of the toothpick?Spay paint is fine since you're just starting out and you got a big piece of plastic to paint. Go for acrylic based and stuff that specifically says that it adheres to plastic. But before you spray on the light blue, spray on a coat of white primer to kill that pink color so it won't bleed through after several coats of paint.For details, use acrylic model paint and paint them by hand. THIN YOUR PAINTS. You also don't need to take it apart. Just mask off any places where you DON'T want the blue to go with some masking tape & paper. Use an exacto knife to cut around the tape on tricky detail parts like the headlight.
>Should I use fine sandpaper?>I don't see why you should. You're not cutting off parts or modding it besides the color, are you?>How do I seal it for regular play?In the model section of your local arts & crafts store, there should be spray on sealant. Since you're doing a shiny metal scooter, go for a glossy finish.