hi lenny, as yer man says, id use limelight backing coat with limelight high impact finish as a top coat. not cheap but good hardy product. it does hang wet because its lime based, as the name suggests, so plenty of wetting to keep the shrinkage down. just remember that lime based products do not work with gypsum based products so if the 1m youve hacked off is gypsum then use gypsum otherwise after around a week it will pull away and cause cracking where the 2 meet.