Painting over lacquered paintwork

[Markbon]

Bought an old guitar in a charity shop for my little boy. Only thing is it's pink. We thought it would be a nice project for him to prime it and paint a picture on it.
It's very shiny I assume a lacquer is on top of the pink paint.
Question is what to do next? does it have to be rubbed back hard, not so hard or any other method? Cheers.

 

[Wayners]

240 grade wet and dry. If taking apart use it wet.
Just need to create a key for paint but you don't want scratches. Just take the shine off same as painting a car.

Are you using spray cans? Stand them in hot water to warm them up and they will spray nice.
Primer
Top coats
Lacquer

 

[Scally-Ho]

Treat the surface with Liquid Sandpaper to save dismantling it

 

[opps]

Do you want to remove all of the pink?

If yes, it is a case of finding the correct solvent.

If it is 1 or 2K spray, or waterbased, cellulose thinners will soften and remove the finish, but you will need to wear red PVC gloves. It eats through silicone and nitrile gloves.

 

[Markbon]

Thanks for the help everyone.
The plan is (once it's ready). Prime it, let the little boy draw with pencil his design/pictures, then colour it in with POSCA pens. They are like felt pens but acrylic ink, they're very good by the way. Then lacquer it apparently.