Hello and thank you for allowing me the opportunity to assist you.
Q: how do I regain my Gun Rights in Maine and how will that apply if I am living in any other state , i.e. PA or NJ, trying to purchase a gun?
A: You'll need to request a pardon from Maine's governor. Unfortunately, sealing records won't help since the issue is having civil rights restored, not just hiding your record. A pardon will restore your rights. You can apply for a pardon by using the application found HERE
Q: How do I answer a Federal, NJ or PA state form asking if I was ever a juvenile delinquent or convicted of a felony?
A: If you were convicted, then you'd have to answer affirmatively.
Q: If my records were sealed in Maine have my 2nd Amendment rights to purchase, own and posses been restored?
A: Unfortunately, a sealed record would not restore your 2nd Amendment rights, as stated above, since a sealed record is merely a hidden record, and that is not the same as a restoration of civil rights.
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