Billy Root led the way in Glamorgan's first innings effort of 203 all out with 51 not out, the highest score in the game so far, as Glamorgan took a 17 run lead over the visitors after both sides completed their first innings.
Root admitted that luck always plays a part in difficult conditions and that honours were even at the halfway stage.
"Survival is about a bit of luck and a bit of patience out there, looking at the scores it is a bowler-friendly pitch.
"The ball has moved about for both sides, so it's pretty even with the conditions and the scores."
Lukas Carey added 23 runs in a 9th-wicket partnership of 31 to take Glamorgan into the lead, with Root praising the seamers batting ability and acknowledging that the bowlers will always be in top in a game like this.
"With Lukas you know what he does, it's nice to bat with guys like that to keep them relaxed and to try to get the best out of them.
"Any lead is valuable in the Championship, though it's only 17. The overhead conditions are accentuating everything and if you bowl well you'll get rewards."