I've used it on reskims and sand and cement and hardwall etc and had no problems. As a previous poster has mentioned steer clear of artex though. I like it but it's hard to easily pick up from local merchants or sheds. If it's the delayed set you are looking for try cream of tartar. You can get Dr Oetker? packets for roughly a pound. There are five or six sachets in each and one sachet works perfect on one bag of finish. I am never without them of late. It's shaved a few hours off each dayIs it no good at all on reskims?