This defect occurs because a remainder of air, water or grease between the topcoat and the previous layers of paint, lifting and swelling the finish coat, generating the formation of blisters.
The main difference from the blisters with other types of defects is the characteristic circular shape without breaking of the finish paint.
This defect can usually be placed in layer of paint from the primer to the topcoat, this defect is observed once the paint has dried.
Dirt on the surface which acts as moisture absorbing sponges, once heat is applied or are exposed to certain temperatures, these particles expel water resulting in blisters.
Moisture absorption by the coating, either by lack of crosslinking during the curing process or by absorption of porous substrates prior to application of paint.
Osmosis phenomenon through the paint layer, so that it absorbs water and produces the blisters.
Paint on very cold surfaces in comparison with the environment, so that the ambient humidity precipitates forming water particles on the surface, which generate blister when the paint is applied.
Paint application in high humidity environments.
Insufficient drying of the substrate or previous layer of paint which contains moisture prior to application of paint.
Water sanding on paints or polyester putties, not leaving enough time for complete evaporation or drying the sanded layer.
Use of compressed air without filtering with traces of water, grease, contaminants, etc. ... so that during paint application of this water or contaminants is deposited on the surface and forms blisters.
Do not paint in excessive moisture environmental nor very cold surfaces.
Complete sanding the filler once dried, to avoid leaving occlusions of air during the curing process of the filler.
Verify the proper drying of the paint layer.
Verify the absence of contaminants in the layer of paint.
Perform periodic maintenance to the system of generation and supply of compressed air.
Once the paint has dried it must sand the area with blister until layer without blisters, where once there seal and refinish.
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