What kindof adhesion numbers indicate a satisfactory candidate for top-coating? We have a steel tank with a 40 y.o. lead paint on the exterior that was topcoated 18 years ago with a Macropoxy 920 primer and Corothane II Urethane. The more recent topcoat is showing localized spots of lifting...we'd like to avoid (kick it down the road) the need to do a full removal of the lead coating. When doing glued-dolly tests, what range of numbers indicate an acceptable base coat? Thanks!
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