How to deal with wet blistering of car body paint surface in car spray painting?
Wet blistering on the paint surface of the car body:
Pock-like small bubbles are evenly distributed, with different sizes, which are easy to appear in very hot and humid conditions. These bubbles disappear when the air humidity is reduced, and the paint film becomes flat.
(1) Cause:
①The mutual adhesion between the top coat, middle coat, primer and substrate is not enough, which may cause blistering.
②The paint will be relatively permeable to water. In very hot and humid conditions, water penetrates the paint film in liquid form and then passes through the paint film in the form of vapor, forming moisture bubbles.
(2) Correction method:
①Only dry grinding can be used in wet weather, keep the compressed air dry, and ensure that the sprayed surface is completely dry before spraying.
②The painted parts should not be placed in a hot and humid environment before they are completely dry.
③ When the bubbles are not broken, you can stand and wait for the water to evaporate to restore the paint film to its original state. In serious cases, it must be thoroughly polished and then re-sprayed. The best choice is to strip the paint to bare metal and re-spray.