The way it was put at the convention was if you know of someone not df but who is engaged in sinful activities then you ought to shun them.
To my understanding then, it depends to what extent your sinful activity is known about. I think if you were carrying on a fairly sin free life after fading or you were simply discreet, it could be possible to not be shunned.
It also depends on the individual conscience of the jw as to whether they will apply the shunning counsel. I have heard of a faded jw where one brother shuns him and the rest of the family doesn't. The trouble with that is that the person shunning is deemed to be more loyal and so it can have a knock on effect.