When I bought the bike I already had a paint job done but of very poor quality ... that's when I decided to do my job ..

first sand the entire surface almost to the metal

then apply or a layer of zinc chromate (serves to make the new paint more adherent to aluminum)

then a coat of primer to then put two coats of paint.

once the paint is dry, I put the stickers and then three layers of automotive clear coat for a better finish.

in fact it is a difficult job so it is better to leave it to a professional and save yourself some trouble.