And, by the end, all the Wigan backs had got among the tries, led by right winger Richards, the Super League's leading scorer, who added a penalty and seven conversions to his ninth try of the season for another 20-point haul.
Warriors coach Michael Maguire responded to last week's loss by axing Paul Deacon and Iafeta Paleaaesina, while restoring Cameron Phelps to the full-back berth following his recovery from injury.
New Hull skipper Long also made his return from injury against his home-town club.
But, roundly booed with every touch of the ball, and looking like he was not fully over the hamstring injury that has kept him out for three games, all he had to show for his efforts was a cut head until he grabbed a consolation try five minutes from the end.
Wigan coach Michael Maguire:
"The boys throughout the week really showed a lot of commitment to their training and they got their rewards.
"We were committed until around the 72nd minute and we need to look at that.
"The boys themselves are quite disappointed too. You've got to go for 80 minutes."
Hull FC coach Richard Agar: "I thought Wigan played strongly but we heaped a bit of pressure on ourselves with some errors in our own half and poor kick-finishes and a whole host of penalties.
"We needed a decent share of possession and field position in the start of the second half we couldn't get out of our own half.
"We know we've been well beaten but we know exactly where we've gone wrong."
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.