Alex Gidman's career-best 211 and Hamish Marshall's 106 guided Gloucestershire to an imposing 562-5 declared on the second day of the LV= County Championship game against Kent at Cheltenham.
But Gloucestershire's attack also found bowling on the placid College Ground pitch an equally arduous task as Kent reached 165-2 at stumps, thanks largely to an unbeaten 79 from Sam Northeast and 57 from Robert Key.
Gidman, who started the day on 145, bettered his previous best score of 176, made against Surrey at Bristol in 2009, and went on to become Gloucestershire's first double centurion since Craig Spearman achieved the feat against Warwickshire at Bristol in 2004.
He was eventually run out by Brendan Nash's underarm throw from mid-on, having put on 168 in 41 overs with Marshall for the fourth wicket. His seven-hour innings came off 347 balls, contained 25 fours and two sixes and he has now scored 894 runs this summer at an average of 74.5.
Gloucestershire resumed on 348-3 and Gidman and Marshall added 140 in the morning session in largely untroubled fashion.
A single to midwicket off Ben Harmison brought Gidman his 334-ball double century, which contained 24 fours and two sixes. He then added one more boundary after lunch before he called for a single to mid-on off Charlie Shreck and was beaten by Nash's direct hit.
There was no respite for Kent, though, as Marshall and Benny Howell plundered 53 in seven overs for the fifth wicket. Howell took 16 off one over from Shreck, including a pulled six over square leg, and was unbeaten on 34 from 23 deliveries when Marshall's dismissal brought the declaration from skipper Michael Klinger.
Marshall had reached his third century of the summer with a single to cover off Harmison and had moved onto 106, with 12 fours and a six, when he holed out to Calum Haggett on the midwicket boundary, which gave James Tredwell his first County Championship wicket of the summer.
Bat continued to dominate ball as Northeast and Key took Kent to 61 without loss at tea with few alarms.
But it was not quite so comfortable for the batsmen in the final session as Key pushed forward to Will Gidman and snicked a low catch to wicketkeeper Gareth Roderick and Daniel Bell-Drummond was bowled by Howell for 21 with four overs of the day remaining.