Luke Wright and Ben Brown registered their highest first-class scores but rain denied Sussex the chance to tighten the screw even further against Durham on day two of their LV= County Championship Division One clash at the BrightonandHoveJobs.com County Ground.
Wright bettered his previous best of 187 by two runs, while Brown's innings of 163 is the highest first-class score by a Sussex number seven, with the duo extending their record-breaking partnership to 335 before Chris Rushworth made the breakthrough.
But while the pair's efforts have helped to put the hosts in firm command of proceedings on 505 for nine, just 17.4 overs of play were possible on the south coast with the inclement weather contriving to spoil Sussex's hopes of putting Durham under significant pressure.
Indeed, no play was possible after lunch although Sussex would have been pleased they were able to kick on despite losing wickets against Durham, who were once again without star bowler Graham Onions due to a back injury he sustained yesterday, in a session that was also interrupted by rain.
Resuming on 441 for five, Wright went past his highest first-class score in the 100th over but he was denied the chance to make a maiden double hundred when he edged the toiling Rushworth behind.
Ashar Zaidi lasted just two balls before departing in the same manner, while Brown was bowled by Mark Wood - who also accounted for James Anyon shortly afterwards.
Three fours from Steve Magoffin took Sussex past 500, with the elements promptly arriving to bring what would prove to be a definitive end to the day.