hi lads,just did a job for a lady, reskimmed 2 walls,it was a thick plyboard/thin chip board and had some kind of lime plaster or coating on it. i told her the done thing was to tear it down & board n skim but she said she was on a budget. i told her if there were repercussions she'd been warned. i wba & skimmed. it's a realy old house,but the walls were solid. i assume this was the way before p.board started getting used? will it stand the test of time? cheers