Powder coaters normally shot blast first, so i guess it depends what you are getting done ie if its delicate you might want to strip it yourself or it may be slightly cheaper to strip it yourself first.
A powder coater last week did my frame the wrong colour, asked for orange and got dark metallic red, :shock: He said if I didn't like it he would strip it in a tank of acid. :shock: I didn't think it would be a good move to fill the frame with acid. I stripped it by hand the first time cos I didn't want him spending too long blasting it incase he holed it .... which he did :roll:
Stripped by hand a second time filled the holes with braze and it is now at another powder coat company.
So yeah I would strip it by hand ... and don't leave it with a donkey.
I was told that there is a maximum time of about 5 days between blasting and powder coating. This is probably due to oxidisation and probably doesn't matter for non-steel frames - but I could be completely wrong - it has been known