Hamilton continued to dominate the half and Paixao threaten goal, but lacked the killer finish.
BBC: Hamilton's David Elebert (left) tussles with Sone Aluko
Esson prevented Hamilton from doubling their lead when he tipped a Marco Paixao curling shot past his post.
Accies' Flavio Paixao twice went close, hitting the side netting before seeing a curler saved well by Allan McGregor.
Accies manager Reid swiftly responded with a double substitution, replacing youngsters Hopkirk and Kirkpatrick with striker twins Flavio and Marco Paixao.
Mark McLaughlin headed a Marco Paixao corner just wide, then Saints' Graham Carey tested Tomas Cerny with a powerful late free-kick.
BBC: Alex Neil (r) and Steven Thomson in action at St Mirren Park
Hasselbaink was unlucky not to latch on to a Flavio Paixao cross from the left as the hosts searched for an equaliser.
The deadlock was broken when Flavio Paixao headed Easton's corner beyond Langfield.
BBC: Hamilton's David Elebert (left) tussles with Sone Aluko
Flavio Paixao was fortunate to escape a booking after throwing himself to the ground and claiming for a penalty with five minutes remaining.
BBC: Hamilton's David Elebert (left) tussles with Sone Aluko
The introduction of the Paixao twins from the bench failed to ignite the Hamilton challenge, although a penalty was awarded when Palazuelos felled Flavio.
It was United's turn to be knocked out of their stride and Marco Paixao was off target with a pot shot from 25 yards.
Ten minutes later, Flavio Paixao went one-on-one with Gallacher but, after a 45-yard run, the Portuguese tried to be too smart and the keeper blocked.
Hamilton had the majority of possession in the opening minutes, Easton and Marco Paixao testing Jamie Langfield in the Aberdeen goal with some inventive play.
BBC: Hamilton's David Elebert (left) tussles with Sone Aluko
Flavio Paixao headed home his second goal of the season in the 53rd minute from a Brian Easton corner, bulleting in from six yards out.
BBC: Hamilton's David Elebert (left) tussles with Sone Aluko
Flavio Paixao had an effort blocked on the goal-line in a scramble in the six-yard box, and the same player ballooned a 12-yard shot over the bar.
Flavio Paixao broke free for Accies in the 40th minute and fired for goal under pressure, but Smith managed to edge the ball wide for a corner.
Hamilton took the lead on Tayside through Flavio Paixao's header, but David Goodwillie equalised before the break and Jon Daly struck in injury time to give United victory.
Cameron Bell deputised in goal for Killie in the absence of Alan Combe and was required to parry Richard Offiong's shot, with Flavio Paixao firing the rebound into the side-netting.
Moments later the diminutive Imrie headed over from Brian Easton's cross and, as Accies applied a stranglehold on their hosts, Mark McLaughlin did likewise from a 35th-minute Flavio Paixao corner.
Accies boss Billy Reid dropped strikers Marco Paixao and his twin brother Flavio in favour of McLaughlin and Dougie Imrie, but it was McArthur who first threatened the Saints goal.
BBC: Alex Neil (r) and Steven Thomson in action at St Mirren Park
With plenty of space available both sides pushed forward and Paixao tested Forster after beating Majstorovic before Celtic went straight to other end where Stokes was denied by Cerny's low save.
Accies made four changes following their midweek defeat by St Johnstone, with Mark McLaughlin, Lee Kilday, Marco Paixao and Jon Rougledge replacing Jim McAlister, James Chambers, Ziggy Gordon and Damien Casalinuovo.
Paixao continued to pose a threat to United in the second half and the Portuguese player crossed invitingly for Mickael Antoine-Curier but the big striker could not direct his header on target.
Reid adjusted his line-up within a few minutes of the re-start, Flavio Paixao replacing the injured James Wesolowski, Leicester City's on-loan midfielder keen to clinch a place in Australia's World Cup squad.
BBC: Alex Neil (r) and Steven Thomson in action at St Mirren Park
Imrie blasted over Esson's bar five minutes into the second half, after an impressive burst of pace by Hasselbaink had first set up Flavio Paixao then the diminutive former Clyde and Inverness player.
There won't be many Scots in the side for the start of the season, but the Portuguese twins Marco and Flavio Paixao look like they could bring some variety and competition for places.
Mark McLaughlin got too much on his header when Marco Paixao swung in a right-footed corner and Gallacher would have been relieved to see the ball flash a yard wide of his post.
BBC: Alex Neil (r) and Steven Thomson in action at St Mirren Park
Hearts keeper Marian Kello was called into action in the 50th minute for the first time when he made a fine save from Elebert's close-range header following an in-swinging cross from Flavio Paixao.
In a rare attempt on goal for the remainder of the half, Caley Thistle's Esson produced a marvellous save, tipping a Marco Paixao curling effort from the edge of the box round the post.
Flavio Paixao ought to have scored when Simon Mensing found time and space down the right to pick out the Portuguese forward, but he skewed his shot a few inches past Allan McGregor's post.
Flavio Paixao could have opened the scoring in the 17th minute when Easton sent over a searching cross from the left, but the Portuguese forward was a yard off the pace and the opportunity was lost.
BBC: Hamilton's David Elebert (left) tussles with Sone Aluko
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