Adhesion test and topcoating
Adhesion test and topcoating
(OP)
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!
RE: Adhesion test and topcoating
Since you need to really ensure the sound coating, as a coating specialist I would suggest to get at least 6MPa as the acceptance criteria.
Regards
RE: Adhesion test and topcoating