Re: gt2 frame
Based on what I have learned here from other member's experiences, the coating is a protective measure for long term storage, nothing more. It does come off easily. It is not a primer coating, actually seems to be a paint repellent really.
A self etching primer specifically made for use with aluminum is recommended before painting.
Some members have had the frame powder coated too.
"It's a chinagirl. It's a sometimes fun little engine that often will break your heart. It's disposable.
Does not come with a fortune cookie."