Peeling may result from one, or a combination, of several factors. First, Improper cleaning of the old surface. Second, improper or incompatible undercoats were used. Lastly, if bulk lacquers are being used, unbalanced thinning agents were used. Ensure the previous surface is always clean before applying a finish. Also, always use products from the same system to avoid incompatibility problems. Often this may only be corrected by sanding and re-finishing the affected area.