glassed? whats that mean?

All its got on the sheet is:

Repair details: remove rear trimand fit new rear arch parts to both sides.
Prepare, spray to match?

Seems abit vague doesnt it? is there anything i need to ask then like is it all welded and not glassed?

also im not sure if there painting the whole r/quarter because when i went round there in person to show them, he said they cut it out and the new part only goes up about 2-3inches from the arch, so theres no need to paint the whole r/quarter is there?