right finally sorted it , normally i wouldnt sponge addie coat but the topper is parex DPR sand fine its really fine rubs up like sand & cement so addie coat has to be bang on,or it look shite , i have been doin mesh coat one then day top coat next day when picked up a little spray mist of water and rub up like mp75 with sponge float,leave to pick up and spat again ,this leaves it flat as f@ck, also traps water in surface stops it from goin off too quick , next morn rub up lightly with round drywall sponge , it is pretty much perfect finish, lot of pissing about but like i said DPR sand fine is really unforgiving