How should polyurea be prepared for overcoating after initial cure of the polyurea?
Prior to overcoating polyurea make sure it is clean. For the first several hours after polyurea has gelled it may be suitable for overcoating without further preparation. If polyurea base coat material has been in place for longer than six hours there could be problems with inter-coat adhesion. Since fewer products are carried in aromatic solvent, which tacktify polyurea you must undertake this process. To assure inter-coat bond apply a liberal amount of denatured alcohol (or more aggressive solvent such as acetone or MEK) to polyurea and allowed to evaporate completely. This will re-tack the polyurea base coat and allow proper adhesion of the follow-on overcoat. This same procedure should be used when bonding polyurea to polyurea after initial cure has taken place.
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