All-rounder Craig Meschede believes Glamorgan "came back nicely" against Gloucestershire despite the visitors being two runs ahead with four wickets in hand going into day three.
A stand of 129 between Benny Howell (67) and Hamish Marshall (70) helped Gloucestershire to 301-6 in reply to Glamorgan's 299 all out in Swansea.
Meschede knows it could be an important first session on day three.
"If we just keep the momentum going forward, we can really put them under pressure," he said.
Glamorgan are waiting to see whether Graham Wagg is able to bowl after suffering a slight hamstring problem which he initially thought was cramp.
Wagg came back onto the field in the evening but did not bowl again.
Meschede, who claimed 3-70, is confident Glamorgan can re-take the initiative.
"I don't think we bowled particularly well in the first two sessions, I think the pitch was offering enough with the ball," Meschede added.
"I think we came back nicely in that last session. I think if we can just keep that up, keep the momentum going forward, we can get a couple of wickets and run through them."
Glamorgan thought they had another wicket from the final ball of the day when Colin Ingram claimed a slip catch off the edge of Jack Taylor's bat but the umpires could not be sure the ball carried cleanly.
With a poor weather forecast for Sunday, Meschede knows Glamorgan need to turn the game round quickly to keep up their pursuit of second-placed Surrey in Division Two.
"I don't think we can afford to have any draws or losses, it's got to be a big game for us," he added.