South African internationalist Ruan Pienaar scored all the points for the big-spending Irish province, including a last-minute penalty to undo a gutsy, but youthful Warriors side.
Sean told the Evening Times: “The boys gave me absolutely everything and they are getting better with every game and learning from their experiences.
“Young guys like Robert Harley and Ryan Wilson are just getting better with every game, while I was delighted for Ryan Grant to get his try.
“It has been a very difficult season due to injuries and, although that has meant we have had to blood more of our young players than has been ideal, there will be big positives for next season.”
“I would hope we will have Graeme Morrison back for the trip to Aironi and that will be a huge boost. His leadership in the back line and all his other qualities have been badly missed.
“I feel it was very harsh for us only to get the losing bonus point and, ultimately, the decisions and errors of two individuals have cost us a win over an Ulster side stocked with world-class talent and that is frustrating.
“But we are improving. The defence was outstanding and that is an area we’ve been working on. So we can take a lot of positives from that going to the Stadio Zaffanella on Saturday.”
Max Evans, who is nursing ankle-ligament damage, and skipper Alastair Kellock, who has a wrist injury, look likely to miss out.
The game in Italy may also come too early for John Barclay who is still nursing several knocks from Scotland’s Six Nations campaign.
Chris Cusiter is also still some way off a return from the knee injury that has kept him out all season.
It's understood Glasgow's focus for summer signings will be concentrated on adding more firepower to his back division.