Very Small Sign installatation - requiring bonded

[soho]

Hi,
I am self employed, 30 years in the sign business, credit 750 and no client complaints.
I have a new client that has a sign install job that they are requiring the installer, me, to be bonded. The signs are 12" by 20" (approx.) with a plug cord, like a table lamp. These signs will sit on the counter in a variety of small buisiness stores. I am to deliver and plug in the sign.

What type of bond do I need for this?
This program is in Delaware and I live in Connecticut. Is bonding specific to the job and or the state?
If a court document is expunged does it exist? Does it count?
How does one answer the question, have I ever been convicted...?
Yes, but it was expunged. Not a felony, and was 25 years ago.
Was told the answer will be no, like it never happened.
Please advise. Thanks.
PS. Yes, I already have a 2 million liability ins policy.